<?php
/**
 * WordPress API for media display.
 *
 * @package WordPress
 * @subpackage Media
 */

/**
 * Retrieve additional image sizes.
 *
 * @since 4.7.0
 *
 * @global array $_wp_additional_image_sizes
 *
 * @return array Additional images size data.
 */
function wp_get_additional_image_sizes() {
	global $_wp_additional_image_sizes;

	if ( ! $_wp_additional_image_sizes ) {
		$_wp_additional_image_sizes = array();
	}

	return $_wp_additional_image_sizes;
}

/**
 * Scale down the default size of an image.
 *
 * This is so that the image is a better fit for the editor and theme.
 *
 * The `$size` parameter accepts either an array or a string. The supported string
 * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at
 * 128 width and 96 height in pixels. Also supported for the string value is
 * 'medium', 'medium_large' and 'full'. The 'full' isn't actually supported, but any value other
 * than the supported will result in the content_width size or 500 if that is
 * not set.
 *
 * Finally, there is a filter named {@see 'editor_max_image_size'}, that will be
 * called on the calculated array for width and height, respectively.
 *
 * @since 2.5.0
 *
 * @global int $content_width
 *
 * @param int          $width   Width of the image in pixels.
 * @param int          $height  Height of the image in pixels.
 * @param string|int[] $size    Optional. Image size. Accepts any registered image size name, or an array
 *                              of width and height values in pixels (in that order). Default 'medium'.
 * @param string       $context Optional. Could be 'display' (like in a theme) or 'edit'
 *                              (like inserting into an editor). Default null.
 * @return int[] {
 *     An array of width and height values.
 *
 *     @type int $0 The maximum width in pixels.
 *     @type int $1 The maximum height in pixels.
 * }
 */
function image_constrain_size_for_editor( $width, $height, $size = 'medium', $context = null ) {
	global $content_width;

	$_wp_additional_image_sizes = wp_get_additional_image_sizes();

	if ( ! $context ) {
		$context = is_admin() ? 'edit' : 'display';
	}

	if ( is_array( $size ) ) {
		$max_width  = $size[0];
		$max_height = $size[1];
	} elseif ( 'thumb' === $size || 'thumbnail' === $size ) {
		$max_width  = (int) get_option( 'thumbnail_size_w' );
		$max_height = (int) get_option( 'thumbnail_size_h' );
		// Last chance thumbnail size defaults.
		if ( ! $max_width && ! $max_height ) {
			$max_width  = 128;
			$max_height = 96;
		}
	} elseif ( 'medium' === $size ) {
		$max_width  = (int) get_option( 'medium_size_w' );
		$max_height = (int) get_option( 'medium_size_h' );

	} elseif ( 'medium_large' === $size ) {
		$max_width  = (int) get_option( 'medium_large_size_w' );
		$max_height = (int) get_option( 'medium_large_size_h' );

		if ( (int) $content_width > 0 ) {
			$max_width = min( (int) $content_width, $max_width );
		}
	} elseif ( 'large' === $size ) {
		/*
		 * We're inserting a large size image into the editor. If it's a really
		 * big image we'll scale it down to fit reasonably within the editor
		 * itself, and within the theme's content width if it's known. The user
		 * can resize it in the editor if they wish.
		 */
		$max_width  = (int) get_option( 'large_size_w' );
		$max_height = (int) get_option( 'large_size_h' );

		if ( (int) $content_width > 0 ) {
			$max_width = min( (int) $content_width, $max_width );
		}
	} elseif ( ! empty( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ), true ) ) {
		$max_width  = (int) $_wp_additional_image_sizes[ $size ]['width'];
		$max_height = (int) $_wp_additional_image_sizes[ $size ]['height'];
		// Only in admin. Assume that theme authors know what they're doing.
		if ( (int) $content_width > 0 && 'edit' === $context ) {
			$max_width = min( (int) $content_width, $max_width );
		}
	} else { // $size === 'full' has no constraint.
		$max_width  = $width;
		$max_height = $height;
	}

	/**
	 * Filters the maximum image size dimensions for the editor.
	 *
	 * @since 2.5.0
	 *
	 * @param int[]        $max_image_size {
	 *     An array of width and height values.
	 *
	 *     @type int $0 The maximum width in pixels.
	 *     @type int $1 The maximum height in pixels.
	 * }
	 * @param string|int[] $size     Requested image size. Can be any registered image size name, or
	 *                               an array of width and height values in pixels (in that order).
	 * @param string       $context  The context the image is being resized for.
	 *                               Possible values are 'display' (like in a theme)
	 *                               or 'edit' (like inserting into an editor).
	 */
	list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size, $context );

	return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
}

/**
 * Retrieve width and height attributes using given width and height values.
 *
 * Both attributes are required in the sense that both parameters must have a
 * value, but are optional in that if you set them to false or null, then they
 * will not be added to the returned string.
 *
 * You can set the value using a string, but it will only take numeric values.
 * If you wish to put 'px' after the numbers, then it will be stripped out of
 * the return.
 *
 * @since 2.5.0
 *
 * @param int|string $width  Image width in pixels.
 * @param int|string $height Image height in pixels.
 * @return string HTML attributes for width and, or height.
 */
function image_hwstring( $width, $height ) {
	$out = '';
	if ( $width ) {
		$out .= 'width="' . (int) $width . '" ';
	}
	if ( $height ) {
		$out .= 'height="' . (int) $height . '" ';
	}
	return $out;
}

/**
 * Scale an image to fit a particular size (such as 'thumb' or 'medium').
 *
 * The URL might be the original image, or it might be a resized version. This
 * function won't create a new resized copy, it will just return an already
 * resized one if it exists.
 *
 * A plugin may use the {@see 'image_downsize'} filter to hook into and offer image
 * resizing services for images. The hook must return an array with the same
 * elements that are normally returned from the function.
 *
 * @since 2.5.0
 *
 * @param int          $id   Attachment ID for image.
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'medium'.
 * @return array|false {
 *     Array of image data, or boolean false if no image is available.
 *
 *     @type string $0 Image source URL.
 *     @type int    $1 Image width in pixels.
 *     @type int    $2 Image height in pixels.
 *     @type bool   $3 Whether the image is a resized image.
 * }
 */
function image_downsize( $id, $size = 'medium' ) {
	$is_image = wp_attachment_is_image( $id );

	/**
	 * Filters whether to preempt the output of image_downsize().
	 *
	 * Returning a truthy value from the filter will effectively short-circuit
	 * down-sizing the image, returning that value instead.
	 *
	 * @since 2.5.0
	 *
	 * @param bool|array   $downsize Whether to short-circuit the image downsize.
	 * @param int          $id       Attachment ID for image.
	 * @param string|int[] $size     Requested image size. Can be any registered image size name, or
	 *                               an array of width and height values in pixels (in that order).
	 */
	$out = apply_filters( 'image_downsize', false, $id, $size );

	if ( $out ) {
		return $out;
	}

	$img_url          = wp_get_attachment_url( $id );
	$meta             = wp_get_attachment_metadata( $id );
	$width            = 0;
	$height           = 0;
	$is_intermediate  = false;
	$img_url_basename = wp_basename( $img_url );

	// If the file isn't an image, attempt to replace its URL with a rendered image from its meta.
	// Otherwise, a non-image type could be returned.
	if ( ! $is_image ) {
		if ( ! empty( $meta['sizes']['full'] ) ) {
			$img_url          = str_replace( $img_url_basename, $meta['sizes']['full']['file'], $img_url );
			$img_url_basename = $meta['sizes']['full']['file'];
			$width            = $meta['sizes']['full']['width'];
			$height           = $meta['sizes']['full']['height'];
		} else {
			return false;
		}
	}

	// Try for a new style intermediate size.
	$intermediate = image_get_intermediate_size( $id, $size );

	if ( $intermediate ) {
		$img_url         = str_replace( $img_url_basename, $intermediate['file'], $img_url );
		$width           = $intermediate['width'];
		$height          = $intermediate['height'];
		$is_intermediate = true;
	} elseif ( 'thumbnail' === $size ) {
		// Fall back to the old thumbnail.
		$thumb_file = wp_get_attachment_thumb_file( $id );
		$info       = null;

		if ( $thumb_file ) {
			$info = wp_getimagesize( $thumb_file );
		}

		if ( $thumb_file && $info ) {
			$img_url         = str_replace( $img_url_basename, wp_basename( $thumb_file ), $img_url );
			$width           = $info[0];
			$height          = $info[1];
			$is_intermediate = true;
		}
	}

	if ( ! $width && ! $height && isset( $meta['width'], $meta['height'] ) ) {
		// Any other type: use the real image.
		$width  = $meta['width'];
		$height = $meta['height'];
	}

	if ( $img_url ) {
		// We have the actual image size, but might need to further constrain it if content_width is narrower.
		list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );

		return array( $img_url, $width, $height, $is_intermediate );
	}

	return false;
}

/**
 * Register a new image size.
 *
 * @since 2.9.0
 *
 * @global array $_wp_additional_image_sizes Associative array of additional image sizes.
 *
 * @param string     $name   Image size identifier.
 * @param int        $width  Optional. Image width in pixels. Default 0.
 * @param int        $height Optional. Image height in pixels. Default 0.
 * @param bool|array $crop   Optional. Image cropping behavior. If false, the image will be scaled (default),
 *                           If true, image will be cropped to the specified dimensions using center positions.
 *                           If an array, the image will be cropped using the array to specify the crop location.
 *                           Array values must be in the format: array( x_crop_position, y_crop_position ) where:
 *                               - x_crop_position accepts: 'left', 'center', or 'right'.
 *                               - y_crop_position accepts: 'top', 'center', or 'bottom'.
 */
function add_image_size( $name, $width = 0, $height = 0, $crop = false ) {
	global $_wp_additional_image_sizes;

	$_wp_additional_image_sizes[ $name ] = array(
		'width'  => absint( $width ),
		'height' => absint( $height ),
		'crop'   => $crop,
	);
}

/**
 * Check if an image size exists.
 *
 * @since 3.9.0
 *
 * @param string $name The image size to check.
 * @return bool True if the image size exists, false if not.
 */
function has_image_size( $name ) {
	$sizes = wp_get_additional_image_sizes();
	return isset( $sizes[ $name ] );
}

/**
 * Remove a new image size.
 *
 * @since 3.9.0
 *
 * @global array $_wp_additional_image_sizes
 *
 * @param string $name The image size to remove.
 * @return bool True if the image size was successfully removed, false on failure.
 */
function remove_image_size( $name ) {
	global $_wp_additional_image_sizes;

	if ( isset( $_wp_additional_image_sizes[ $name ] ) ) {
		unset( $_wp_additional_image_sizes[ $name ] );
		return true;
	}

	return false;
}

/**
 * Registers an image size for the post thumbnail.
 *
 * @since 2.9.0
 *
 * @see add_image_size() for details on cropping behavior.
 *
 * @param int        $width  Image width in pixels.
 * @param int        $height Image height in pixels.
 * @param bool|array $crop   Optional. Whether to crop images to specified width and height or resize.
 *                           An array can specify positioning of the crop area. Default false.
 */
function set_post_thumbnail_size( $width = 0, $height = 0, $crop = false ) {
	add_image_size( 'post-thumbnail', $width, $height, $crop );
}

/**
 * Gets an img tag for an image attachment, scaling it down if requested.
 *
 * The {@see 'get_image_tag_class'} filter allows for changing the class name for the
 * image without having to use regular expressions on the HTML content. The
 * parameters are: what WordPress will use for the class, the Attachment ID,
 * image align value, and the size the image should be.
 *
 * The second filter, {@see 'get_image_tag'}, has the HTML content, which can then be
 * further manipulated by a plugin to change all attribute values and even HTML
 * content.
 *
 * @since 2.5.0
 *
 * @param int          $id    Attachment ID.
 * @param string       $alt   Image description for the alt attribute.
 * @param string       $title Image description for the title attribute.
 * @param string       $align Part of the class name for aligning the image.
 * @param string|int[] $size  Optional. Image size. Accepts any registered image size name, or an array of
 *                            width and height values in pixels (in that order). Default 'medium'.
 * @return string HTML IMG element for given image attachment
 */
function get_image_tag( $id, $alt, $title, $align, $size = 'medium' ) {

	list( $img_src, $width, $height ) = image_downsize( $id, $size );
	$hwstring                         = image_hwstring( $width, $height );

	$title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';

	$size_class = is_array( $size ) ? implode( 'x', $size ) : $size;
	$class      = 'align' . esc_attr( $align ) . ' size-' . esc_attr( $size_class ) . ' wp-image-' . $id;

	/**
	 * Filters the value of the attachment's image tag class attribute.
	 *
	 * @since 2.6.0
	 *
	 * @param string       $class CSS class name or space-separated list of classes.
	 * @param int          $id    Attachment ID.
	 * @param string       $align Part of the class name for aligning the image.
	 * @param string|int[] $size  Requested image size. Can be any registered image size name, or
	 *                            an array of width and height values in pixels (in that order).
	 */
	$class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );

	$html = '<img src="' . esc_attr( $img_src ) . '" alt="' . esc_attr( $alt ) . '" ' . $title . $hwstring . 'class="' . $class . '" />';

	/**
	 * Filters the HTML content for the image tag.
	 *
	 * @since 2.6.0
	 *
	 * @param string       $html  HTML content for the image.
	 * @param int          $id    Attachment ID.
	 * @param string       $alt   Image description for the alt attribute.
	 * @param string       $title Image description for the title attribute.
	 * @param string       $align Part of the class name for aligning the image.
	 * @param string|int[] $size  Requested image size. Can be any registered image size name, or
	 *                            an array of width and height values in pixels (in that order).
	 */
	return apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
}

/**
 * Calculates the new dimensions for a down-sampled image.
 *
 * If either width or height are empty, no constraint is applied on
 * that dimension.
 *
 * @since 2.5.0
 *
 * @param int $current_width  Current width of the image.
 * @param int $current_height Current height of the image.
 * @param int $max_width      Optional. Max width in pixels to constrain to. Default 0.
 * @param int $max_height     Optional. Max height in pixels to constrain to. Default 0.
 * @return int[] {
 *     An array of width and height values.
 *
 *     @type int $0 The width in pixels.
 *     @type int $1 The height in pixels.
 * }
 */
function wp_constrain_dimensions( $current_width, $current_height, $max_width = 0, $max_height = 0 ) {
	if ( ! $max_width && ! $max_height ) {
		return array( $current_width, $current_height );
	}

	$width_ratio  = 1.0;
	$height_ratio = 1.0;
	$did_width    = false;
	$did_height   = false;

	if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width ) {
		$width_ratio = $max_width / $current_width;
		$did_width   = true;
	}

	if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height ) {
		$height_ratio = $max_height / $current_height;
		$did_height   = true;
	}

	// Calculate the larger/smaller ratios.
	$smaller_ratio = min( $width_ratio, $height_ratio );
	$larger_ratio  = max( $width_ratio, $height_ratio );

	if ( (int) round( $current_width * $larger_ratio ) > $max_width || (int) round( $current_height * $larger_ratio ) > $max_height ) {
		// The larger ratio is too big. It would result in an overflow.
		$ratio = $smaller_ratio;
	} else {
		// The larger ratio fits, and is likely to be a more "snug" fit.
		$ratio = $larger_ratio;
	}

	// Very small dimensions may result in 0, 1 should be the minimum.
	$w = max( 1, (int) round( $current_width * $ratio ) );
	$h = max( 1, (int) round( $current_height * $ratio ) );

	/*
	 * Sometimes, due to rounding, we'll end up with a result like this:
	 * 465x700 in a 177x177 box is 117x176... a pixel short.
	 * We also have issues with recursive calls resulting in an ever-changing result.
	 * Constraining to the result of a constraint should yield the original result.
	 * Thus we look for dimensions that are one pixel shy of the max value and bump them up.
	 */

	// Note: $did_width means it is possible $smaller_ratio == $width_ratio.
	if ( $did_width && $w === $max_width - 1 ) {
		$w = $max_width; // Round it up.
	}

	// Note: $did_height means it is possible $smaller_ratio == $height_ratio.
	if ( $did_height && $h === $max_height - 1 ) {
		$h = $max_height; // Round it up.
	}

	/**
	 * Filters dimensions to constrain down-sampled images to.
	 *
	 * @since 4.1.0
	 *
	 * @param int[] $dimensions     {
	 *     An array of width and height values.
	 *
	 *     @type int $0 The width in pixels.
	 *     @type int $1 The height in pixels.
	 * }
	 * @param int   $current_width  The current width of the image.
	 * @param int   $current_height The current height of the image.
	 * @param int   $max_width      The maximum width permitted.
	 * @param int   $max_height     The maximum height permitted.
	 */
	return apply_filters( 'wp_constrain_dimensions', array( $w, $h ), $current_width, $current_height, $max_width, $max_height );
}

/**
 * Retrieves calculated resize dimensions for use in WP_Image_Editor.
 *
 * Calculates dimensions and coordinates for a resized image that fits
 * within a specified width and height.
 *
 * Cropping behavior is dependent on the value of $crop:
 * 1. If false (default), images will not be cropped.
 * 2. If an array in the form of array( x_crop_position, y_crop_position ):
 *    - x_crop_position accepts 'left' 'center', or 'right'.
 *    - y_crop_position accepts 'top', 'center', or 'bottom'.
 *    Images will be cropped to the specified dimensions within the defined crop area.
 * 3. If true, images will be cropped to the specified dimensions using center positions.
 *
 * @since 2.5.0
 *
 * @param int        $orig_w Original width in pixels.
 * @param int        $orig_h Original height in pixels.
 * @param int        $dest_w New width in pixels.
 * @param int        $dest_h New height in pixels.
 * @param bool|array $crop   Optional. Whether to crop image to specified width and height or resize.
 *                           An array can specify positioning of the crop area. Default false.
 * @return array|false Returned array matches parameters for `imagecopyresampled()`. False on failure.
 */
function image_resize_dimensions( $orig_w, $orig_h, $dest_w, $dest_h, $crop = false ) {

	if ( $orig_w <= 0 || $orig_h <= 0 ) {
		return false;
	}
	// At least one of $dest_w or $dest_h must be specific.
	if ( $dest_w <= 0 && $dest_h <= 0 ) {
		return false;
	}

	/**
	 * Filters whether to preempt calculating the image resize dimensions.
	 *
	 * Returning a non-null value from the filter will effectively short-circuit
	 * image_resize_dimensions(), returning that value instead.
	 *
	 * @since 3.4.0
	 *
	 * @param null|mixed $null   Whether to preempt output of the resize dimensions.
	 * @param int        $orig_w Original width in pixels.
	 * @param int        $orig_h Original height in pixels.
	 * @param int        $dest_w New width in pixels.
	 * @param int        $dest_h New height in pixels.
	 * @param bool|array $crop   Whether to crop image to specified width and height or resize.
	 *                           An array can specify positioning of the crop area. Default false.
	 */
	$output = apply_filters( 'image_resize_dimensions', null, $orig_w, $orig_h, $dest_w, $dest_h, $crop );

	if ( null !== $output ) {
		return $output;
	}

	// Stop if the destination size is larger than the original image dimensions.
	if ( empty( $dest_h ) ) {
		if ( $orig_w < $dest_w ) {
			return false;
		}
	} elseif ( empty( $dest_w ) ) {
		if ( $orig_h < $dest_h ) {
			return false;
		}
	} else {
		if ( $orig_w < $dest_w && $orig_h < $dest_h ) {
			return false;
		}
	}

	if ( $crop ) {
		/*
		 * Crop the largest possible portion of the original image that we can size to $dest_w x $dest_h.
		 * Note that the requested crop dimensions are used as a maximum bounding box for the original image.
		 * If the original image's width or height is less than the requested width or height
		 * only the greater one will be cropped.
		 * For example when the original image is 600x300, and the requested crop dimensions are 400x400,
		 * the resulting image will be 400x300.
		 */
		$aspect_ratio = $orig_w / $orig_h;
		$new_w        = min( $dest_w, $orig_w );
		$new_h        = min( $dest_h, $orig_h );

		if ( ! $new_w ) {
			$new_w = (int) round( $new_h * $aspect_ratio );
		}

		if ( ! $new_h ) {
			$new_h = (int) round( $new_w / $aspect_ratio );
		}

		$size_ratio = max( $new_w / $orig_w, $new_h / $orig_h );

		$crop_w = round( $new_w / $size_ratio );
		$crop_h = round( $new_h / $size_ratio );

		if ( ! is_array( $crop ) || count( $crop ) !== 2 ) {
			$crop = array( 'center', 'center' );
		}

		list( $x, $y ) = $crop;

		if ( 'left' === $x ) {
			$s_x = 0;
		} elseif ( 'right' === $x ) {
			$s_x = $orig_w - $crop_w;
		} else {
			$s_x = floor( ( $orig_w - $crop_w ) / 2 );
		}

		if ( 'top' === $y ) {
			$s_y = 0;
		} elseif ( 'bottom' === $y ) {
			$s_y = $orig_h - $crop_h;
		} else {
			$s_y = floor( ( $orig_h - $crop_h ) / 2 );
		}
	} else {
		// Resize using $dest_w x $dest_h as a maximum bounding box.
		$crop_w = $orig_w;
		$crop_h = $orig_h;

		$s_x = 0;
		$s_y = 0;

		list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
	}

	if ( wp_fuzzy_number_match( $new_w, $orig_w ) && wp_fuzzy_number_match( $new_h, $orig_h ) ) {
		// The new size has virtually the same dimensions as the original image.

		/**
		 * Filters whether to proceed with making an image sub-size with identical dimensions
		 * with the original/source image. Differences of 1px may be due to rounding and are ignored.
		 *
		 * @since 5.3.0
		 *
		 * @param bool $proceed The filtered value.
		 * @param int  $orig_w  Original image width.
		 * @param int  $orig_h  Original image height.
		 */
		$proceed = (bool) apply_filters( 'wp_image_resize_identical_dimensions', false, $orig_w, $orig_h );

		if ( ! $proceed ) {
			return false;
		}
	}

	// The return array matches the parameters to imagecopyresampled().
	// int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
	return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
}

/**
 * Resizes an image to make a thumbnail or intermediate size.
 *
 * The returned array has the file size, the image width, and image height. The
 * {@see 'image_make_intermediate_size'} filter can be used to hook in and change the
 * values of the returned array. The only parameter is the resized file path.
 *
 * @since 2.5.0
 *
 * @param string $file   File path.
 * @param int    $width  Image width.
 * @param int    $height Image height.
 * @param bool   $crop   Optional. Whether to crop image to specified width and height or resize.
 *                       Default false.
 * @return array|false Metadata array on success. False if no image was created.
 */
function image_make_intermediate_size( $file, $width, $height, $crop = false ) {
	if ( $width || $height ) {
		$editor = wp_get_image_editor( $file );

		if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) ) {
			return false;
		}

		$resized_file = $editor->save();

		if ( ! is_wp_error( $resized_file ) && $resized_file ) {
			unset( $resized_file['path'] );
			return $resized_file;
		}
	}
	return false;
}

/**
 * Helper function to test if aspect ratios for two images match.
 *
 * @since 4.6.0
 *
 * @param int $source_width  Width of the first image in pixels.
 * @param int $source_height Height of the first image in pixels.
 * @param int $target_width  Width of the second image in pixels.
 * @param int $target_height Height of the second image in pixels.
 * @return bool True if aspect ratios match within 1px. False if not.
 */
function wp_image_matches_ratio( $source_width, $source_height, $target_width, $target_height ) {
	/*
	 * To test for varying crops, we constrain the dimensions of the larger image
	 * to the dimensions of the smaller image and see if they match.
	 */
	if ( $source_width > $target_width ) {
		$constrained_size = wp_constrain_dimensions( $source_width, $source_height, $target_width );
		$expected_size    = array( $target_width, $target_height );
	} else {
		$constrained_size = wp_constrain_dimensions( $target_width, $target_height, $source_width );
		$expected_size    = array( $source_width, $source_height );
	}

	// If the image dimensions are within 1px of the expected size, we consider it a match.
	$matched = ( wp_fuzzy_number_match( $constrained_size[0], $expected_size[0] ) && wp_fuzzy_number_match( $constrained_size[1], $expected_size[1] ) );

	return $matched;
}

/**
 * Retrieves the image's intermediate size (resized) path, width, and height.
 *
 * The $size parameter can be an array with the width and height respectively.
 * If the size matches the 'sizes' metadata array for width and height, then it
 * will be used. If there is no direct match, then the nearest image size larger
 * than the specified size will be used. If nothing is found, then the function
 * will break out and return false.
 *
 * The metadata 'sizes' is used for compatible sizes that can be used for the
 * parameter $size value.
 *
 * The url path will be given, when the $size parameter is a string.
 *
 * If you are passing an array for the $size, you should consider using
 * add_image_size() so that a cropped version is generated. It's much more
 * efficient than having to find the closest-sized image and then having the
 * browser scale down the image.
 *
 * @since 2.5.0
 *
 * @param int          $post_id Attachment ID.
 * @param string|int[] $size    Optional. Image size. Accepts any registered image size name, or an array
 *                              of width and height values in pixels (in that order). Default 'thumbnail'.
 * @return array|false {
 *     Array of file relative path, width, and height on success. Additionally includes absolute
 *     path and URL if registered size is passed to `$size` parameter. False on failure.
 *
 *     @type string $file   Path of image relative to uploads directory.
 *     @type int    $width  Width of image in pixels.
 *     @type int    $height Height of image in pixels.
 *     @type string $path   Absolute filesystem path of image.
 *     @type string $url    URL of image.
 * }
 */
function image_get_intermediate_size( $post_id, $size = 'thumbnail' ) {
	$imagedata = wp_get_attachment_metadata( $post_id );

	if ( ! $size || ! is_array( $imagedata ) || empty( $imagedata['sizes'] ) ) {
		return false;
	}

	$data = array();

	// Find the best match when '$size' is an array.
	if ( is_array( $size ) ) {
		$candidates = array();

		if ( ! isset( $imagedata['file'] ) && isset( $imagedata['sizes']['full'] ) ) {
			$imagedata['height'] = $imagedata['sizes']['full']['height'];
			$imagedata['width']  = $imagedata['sizes']['full']['width'];
		}

		foreach ( $imagedata['sizes'] as $_size => $data ) {
			// If there's an exact match to an existing image size, short circuit.
			if ( (int) $data['width'] === (int) $size[0] && (int) $data['height'] === (int) $size[1] ) {
				$candidates[ $data['width'] * $data['height'] ] = $data;
				break;
			}

			// If it's not an exact match, consider larger sizes with the same aspect ratio.
			if ( $data['width'] >= $size[0] && $data['height'] >= $size[1] ) {
				// If '0' is passed to either size, we test ratios against the original file.
				if ( 0 === $size[0] || 0 === $size[1] ) {
					$same_ratio = wp_image_matches_ratio( $data['width'], $data['height'], $imagedata['width'], $imagedata['height'] );
				} else {
					$same_ratio = wp_image_matches_ratio( $data['width'], $data['height'], $size[0], $size[1] );
				}

				if ( $same_ratio ) {
					$candidates[ $data['width'] * $data['height'] ] = $data;
				}
			}
		}

		if ( ! empty( $candidates ) ) {
			// Sort the array by size if we have more than one candidate.
			if ( 1 < count( $candidates ) ) {
				ksort( $candidates );
			}

			$data = array_shift( $candidates );
			/*
			* When the size requested is smaller than the thumbnail dimensions, we
			* fall back to the thumbnail size to maintain backward compatibility with
			* pre 4.6 versions of WordPress.
			*/
		} elseif ( ! empty( $imagedata['sizes']['thumbnail'] ) && $imagedata['sizes']['thumbnail']['width'] >= $size[0] && $imagedata['sizes']['thumbnail']['width'] >= $size[1] ) {
			$data = $imagedata['sizes']['thumbnail'];
		} else {
			return false;
		}

		// Constrain the width and height attributes to the requested values.
		list( $data['width'], $data['height'] ) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );

	} elseif ( ! empty( $imagedata['sizes'][ $size ] ) ) {
		$data = $imagedata['sizes'][ $size ];
	}

	// If we still don't have a match at this point, return false.
	if ( empty( $data ) ) {
		return false;
	}

	// Include the full filesystem path of the intermediate file.
	if ( empty( $data['path'] ) && ! empty( $data['file'] ) && ! empty( $imagedata['file'] ) ) {
		$file_url     = wp_get_attachment_url( $post_id );
		$data['path'] = path_join( dirname( $imagedata['file'] ), $data['file'] );
		$data['url']  = path_join( dirname( $file_url ), $data['file'] );
	}

	/**
	 * Filters the output of image_get_intermediate_size()
	 *
	 * @since 4.4.0
	 *
	 * @see image_get_intermediate_size()
	 *
	 * @param array        $data    Array of file relative path, width, and height on success. May also include
	 *                              file absolute path and URL.
	 * @param int          $post_id The ID of the image attachment.
	 * @param string|int[] $size    Requested image size. Can be any registered image size name, or
	 *                              an array of width and height values in pixels (in that order).
	 */
	return apply_filters( 'image_get_intermediate_size', $data, $post_id, $size );
}

/**
 * Gets the available intermediate image size names.
 *
 * @since 3.0.0
 *
 * @return string[] An array of image size names.
 */
function get_intermediate_image_sizes() {
	$default_sizes    = array( 'thumbnail', 'medium', 'medium_large', 'large' );
	$additional_sizes = wp_get_additional_image_sizes();

	if ( ! empty( $additional_sizes ) ) {
		$default_sizes = array_merge( $default_sizes, array_keys( $additional_sizes ) );
	}

	/**
	 * Filters the list of intermediate image sizes.
	 *
	 * @since 2.5.0
	 *
	 * @param string[] $default_sizes An array of intermediate image size names. Defaults
	 *                                are 'thumbnail', 'medium', 'medium_large', 'large'.
	 */
	return apply_filters( 'intermediate_image_sizes', $default_sizes );
}

/**
 * Returns a normalized list of all currently registered image sub-sizes.
 *
 * @since 5.3.0
 * @uses wp_get_additional_image_sizes()
 * @uses get_intermediate_image_sizes()
 *
 * @return array[] Associative array of arrays of image sub-size information,
 *                 keyed by image size name.
 */
function wp_get_registered_image_subsizes() {
	$additional_sizes = wp_get_additional_image_sizes();
	$all_sizes        = array();

	foreach ( get_intermediate_image_sizes() as $size_name ) {
		$size_data = array(
			'width'  => 0,
			'height' => 0,
			'crop'   => false,
		);

		if ( isset( $additional_sizes[ $size_name ]['width'] ) ) {
			// For sizes added by plugins and themes.
			$size_data['width'] = (int) $additional_sizes[ $size_name ]['width'];
		} else {
			// For default sizes set in options.
			$size_data['width'] = (int) get_option( "{$size_name}_size_w" );
		}

		if ( isset( $additional_sizes[ $size_name ]['height'] ) ) {
			$size_data['height'] = (int) $additional_sizes[ $size_name ]['height'];
		} else {
			$size_data['height'] = (int) get_option( "{$size_name}_size_h" );
		}

		if ( empty( $size_data['width'] ) && empty( $size_data['height'] ) ) {
			// This size isn't set.
			continue;
		}

		if ( isset( $additional_sizes[ $size_name ]['crop'] ) ) {
			$size_data['crop'] = $additional_sizes[ $size_name ]['crop'];
		} else {
			$size_data['crop'] = get_option( "{$size_name}_crop" );
		}

		if ( ! is_array( $size_data['crop'] ) || empty( $size_data['crop'] ) ) {
			$size_data['crop'] = (bool) $size_data['crop'];
		}

		$all_sizes[ $size_name ] = $size_data;
	}

	return $all_sizes;
}

/**
 * Retrieves an image to represent an attachment.
 *
 * @since 2.5.0
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
 *                                    width and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $icon          Optional. Whether the image should fall back to a mime type icon. Default false.
 * @return array|false {
 *     Array of image data, or boolean false if no image is available.
 *
 *     @type string $0 Image source URL.
 *     @type int    $1 Image width in pixels.
 *     @type int    $2 Image height in pixels.
 *     @type bool   $3 Whether the image is a resized image.
 * }
 */
function wp_get_attachment_image_src( $attachment_id, $size = 'thumbnail', $icon = false ) {
	// Get a thumbnail or intermediate image if there is one.
	$image = image_downsize( $attachment_id, $size );
	if ( ! $image ) {
		$src = false;

		if ( $icon ) {
			$src = wp_mime_type_icon( $attachment_id );

			if ( $src ) {
				/** This filter is documented in wp-includes/post.php */
				$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );

				$src_file               = $icon_dir . '/' . wp_basename( $src );
				list( $width, $height ) = wp_getimagesize( $src_file );
			}
		}

		if ( $src && $width && $height ) {
			$image = array( $src, $width, $height, false );
		}
	}
	/**
	 * Filters the attachment image source result.
	 *
	 * @since 4.3.0
	 *
	 * @param array|false  $image         {
	 *     Array of image data, or boolean false if no image is available.
	 *
	 *     @type string $0 Image source URL.
	 *     @type int    $1 Image width in pixels.
	 *     @type int    $2 Image height in pixels.
	 *     @type bool   $3 Whether the image is a resized image.
	 * }
	 * @param int          $attachment_id Image attachment ID.
	 * @param string|int[] $size          Requested image size. Can be any registered image size name, or
	 *                                    an array of width and height values in pixels (in that order).
	 * @param bool         $icon          Whether the image should be treated as an icon.
	 */
	return apply_filters( 'wp_get_attachment_image_src', $image, $attachment_id, $size, $icon );
}

/**
 * Get an HTML img element representing an image attachment.
 *
 * While `$size` will accept an array, it is better to register a size with
 * add_image_size() so that a cropped version is generated. It's much more
 * efficient than having to find the closest-sized image and then having the
 * browser scale down the image.
 *
 * @since 2.5.0
 * @since 4.4.0 The `$srcset` and `$sizes` attributes were added.
 * @since 5.5.0 The `$loading` attribute was added.
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array
 *                                    of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
 * @param string|array $attr {
 *     Optional. Attributes for the image markup.
 *
 *     @type string       $src     Image attachment URL.
 *     @type string       $class   CSS class name or space-separated list of classes.
 *                                 Default `attachment-$size_class size-$size_class`,
 *                                 where `$size_class` is the image size being requested.
 *     @type string       $alt     Image description for the alt attribute.
 *     @type string       $srcset  The 'srcset' attribute value.
 *     @type string       $sizes   The 'sizes' attribute value.
 *     @type string|false $loading The 'loading' attribute value. Passing a value of false
 *                                 will result in the attribute being omitted for the image.
 *                                 Defaults to 'lazy', depending on wp_lazy_loading_enabled().
 * }
 * @return string HTML img element or empty string on failure.
 */
function wp_get_attachment_image( $attachment_id, $size = 'thumbnail', $icon = false, $attr = '' ) {
	$html  = '';
	$image = wp_get_attachment_image_src( $attachment_id, $size, $icon );

	if ( $image ) {
		list( $src, $width, $height ) = $image;

		$attachment = get_post( $attachment_id );
		$hwstring   = image_hwstring( $width, $height );
		$size_class = $size;

		if ( is_array( $size_class ) ) {
			$size_class = implode( 'x', $size_class );
		}

		$default_attr = array(
			'src'   => $src,
			'class' => "attachment-$size_class size-$size_class",
			'alt'   => trim( strip_tags( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) ) ),
		);

		// Add `loading` attribute.
		if ( wp_lazy_loading_enabled( 'img', 'wp_get_attachment_image' ) ) {
			$default_attr['loading'] = wp_get_loading_attr_default( 'wp_get_attachment_image' );
		}

		$attr = wp_parse_args( $attr, $default_attr );

		// If the default value of `lazy` for the `loading` attribute is overridden
		// to omit the attribute for this image, ensure it is not included.
		if ( array_key_exists( 'loading', $attr ) && ! $attr['loading'] ) {
			unset( $attr['loading'] );
		}

		// Generate 'srcset' and 'sizes' if not already present.
		if ( empty( $attr['srcset'] ) ) {
			$image_meta = wp_get_attachment_metadata( $attachment_id );

			if ( is_array( $image_meta ) ) {
				$size_array = array( absint( $width ), absint( $height ) );
				$srcset     = wp_calculate_image_srcset( $size_array, $src, $image_meta, $attachment_id );
				$sizes      = wp_calculate_image_sizes( $size_array, $src, $image_meta, $attachment_id );

				if ( $srcset && ( $sizes || ! empty( $attr['sizes'] ) ) ) {
					$attr['srcset'] = $srcset;

					if ( empty( $attr['sizes'] ) ) {
						$attr['sizes'] = $sizes;
					}
				}
			}
		}

		/**
		 * Filters the list of attachment image attributes.
		 *
		 * @since 2.8.0
		 *
		 * @param string[]     $attr       Array of attribute values for the image markup, keyed by attribute name.
		 *                                 See wp_get_attachment_image().
		 * @param WP_Post      $attachment Image attachment post.
		 * @param string|int[] $size       Requested image size. Can be any registered image size name, or
		 *                                 an array of width and height values in pixels (in that order).
		 */
		$attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size );

		$attr = array_map( 'esc_attr', $attr );
		$html = rtrim( "<img $hwstring" );

		foreach ( $attr as $name => $value ) {
			$html .= " $name=" . '"' . $value . '"';
		}

		$html .= ' />';
	}

	/**
	 * HTML img element representing an image attachment.
	 *
	 * @since 5.6.0
	 *
	 * @param string       $html          HTML img element or empty string on failure.
	 * @param int          $attachment_id Image attachment ID.
	 * @param string|int[] $size          Requested image size. Can be any registered image size name, or
	 *                                    an array of width and height values in pixels (in that order).
	 * @param bool         $icon          Whether the image should be treated as an icon.
	 * @param string[]     $attr          Array of attribute values for the image markup, keyed by attribute name.
	 *                                    See wp_get_attachment_image().
	 */
	return apply_filters( 'wp_get_attachment_image', $html, $attachment_id, $size, $icon, $attr );
}

/**
 * Get the URL of an image attachment.
 *
 * @since 4.4.0
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
 *                                    width and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
 * @return string|false Attachment URL or false if no image is available. If `$size` does not match
 *                      any registered image size, the original image URL will be returned.
 */
function wp_get_attachment_image_url( $attachment_id, $size = 'thumbnail', $icon = false ) {
	$image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
	return isset( $image[0] ) ? $image[0] : false;
}

/**
 * Get the attachment path relative to the upload directory.
 *
 * @since 4.4.1
 * @access private
 *
 * @param string $file Attachment file name.
 * @return string Attachment path relative to the upload directory.
 */
function _wp_get_attachment_relative_path( $file ) {
	$dirname = dirname( $file );

	if ( '.' === $dirname ) {
		return '';
	}

	if ( false !== strpos( $dirname, 'wp-content/uploads' ) ) {
		// Get the directory name relative to the upload directory (back compat for pre-2.7 uploads).
		$dirname = substr( $dirname, strpos( $dirname, 'wp-content/uploads' ) + 18 );
		$dirname = ltrim( $dirname, '/' );
	}

	return $dirname;
}

/**
 * Get the image size as array from its meta data.
 *
 * Used for responsive images.
 *
 * @since 4.4.0
 * @access private
 *
 * @param string $size_name  Image size. Accepts any registered image size name.
 * @param array  $image_meta The image meta data.
 * @return array|false {
 *     Array of width and height or false if the size isn't present in the meta data.
 *
 *     @type int $0 Image width.
 *     @type int $1 Image height.
 * }
 */
function _wp_get_image_size_from_meta( $size_name, $image_meta ) {
	if ( 'full' === $size_name ) {
		return array(
			absint( $image_meta['width'] ),
			absint( $image_meta['height'] ),
		);
	} elseif ( ! empty( $image_meta['sizes'][ $size_name ] ) ) {
		return array(
			absint( $image_meta['sizes'][ $size_name ]['width'] ),
			absint( $image_meta['sizes'][ $size_name ]['height'] ),
		);
	}

	return false;
}

/**
 * Retrieves the value for an image attachment's 'srcset' attribute.
 *
 * @since 4.4.0
 *
 * @see wp_calculate_image_srcset()
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
 *                                    width and height values in pixels (in that order). Default 'medium'.
 * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
 *                                    Default null.
 * @return string|false A 'srcset' value string or false.
 */
function wp_get_attachment_image_srcset( $attachment_id, $size = 'medium', $image_meta = null ) {
	$image = wp_get_attachment_image_src( $attachment_id, $size );

	if ( ! $image ) {
		return false;
	}

	if ( ! is_array( $image_meta ) ) {
		$image_meta = wp_get_attachment_metadata( $attachment_id );
	}

	$image_src  = $image[0];
	$size_array = array(
		absint( $image[1] ),
		absint( $image[2] ),
	);

	return wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
}

/**
 * A helper function to calculate the image sources to include in a 'srcset' attribute.
 *
 * @since 4.4.0
 *
 * @param int[]  $size_array    {
 *     An array of width and height values.
 *
 *     @type int $0 The width in pixels.
 *     @type int $1 The height in pixels.
 * }
 * @param string $image_src     The 'src' of the image.
 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
 * @param int    $attachment_id Optional. The image attachment ID. Default 0.
 * @return string|false The 'srcset' attribute value. False on error or when only one source exists.
 */
function wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id = 0 ) {
	/**
	 * Let plugins pre-filter the image meta to be able to fix inconsistencies in the stored data.
	 *
	 * @since 4.5.0
	 *
	 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
	 * @param int[]  $size_array    {
	 *     An array of requested width and height values.
	 *
	 *     @type int $0 The width in pixels.
	 *     @type int $1 The height in pixels.
	 * }
	 * @param string $image_src     The 'src' of the image.
	 * @param int    $attachment_id The image attachment ID or 0 if not supplied.
	 */
	$image_meta = apply_filters( 'wp_calculate_image_srcset_meta', $image_meta, $size_array, $image_src, $attachment_id );

	if ( empty( $image_meta['sizes'] ) || ! isset( $image_meta['file'] ) || strlen( $image_meta['file'] ) < 4 ) {
		return false;
	}

	$image_sizes = $image_meta['sizes'];

	// Get the width and height of the image.
	$image_width  = (int) $size_array[0];
	$image_height = (int) $size_array[1];

	// Bail early if error/no width.
	if ( $image_width < 1 ) {
		return false;
	}

	$image_basename = wp_basename( $image_meta['file'] );

	/*
	 * WordPress flattens animated GIFs into one frame when generating intermediate sizes.
	 * To avoid hiding animation in user content, if src is a full size GIF, a srcset attribute is not generated.
	 * If src is an intermediate size GIF, the full size is excluded from srcset to keep a flattened GIF from becoming animated.
	 */
	if ( ! isset( $image_sizes['thumbnail']['mime-type'] ) || 'image/gif' !== $image_sizes['thumbnail']['mime-type'] ) {
		$image_sizes[] = array(
			'width'  => $image_meta['width'],
			'height' => $image_meta['height'],
			'file'   => $image_basename,
		);
	} elseif ( strpos( $image_src, $image_meta['file'] ) ) {
		return false;
	}

	// Retrieve the uploads sub-directory from the full size image.
	$dirname = _wp_get_attachment_relative_path( $image_meta['file'] );

	if ( $dirname ) {
		$dirname = trailingslashit( $dirname );
	}

	$upload_dir    = wp_get_upload_dir();
	$image_baseurl = trailingslashit( $upload_dir['baseurl'] ) . $dirname;

	/*
	 * If currently on HTTPS, prefer HTTPS URLs when we know they're supported by the domain
	 * (which is to say, when they share the domain name of the current request).
	 */
	if ( is_ssl() && 'https' !== substr( $image_baseurl, 0, 5 ) && parse_url( $image_baseurl, PHP_URL_HOST ) === $_SERVER['HTTP_HOST'] ) {
		$image_baseurl = set_url_scheme( $image_baseurl, 'https' );
	}

	/*
	 * Images that have been edited in WordPress after being uploaded will
	 * contain a unique hash. Look for that hash and use it later to filter
	 * out images that are leftovers from previous versions.
	 */
	$image_edited = preg_match( '/-e[0-9]{13}/', wp_basename( $image_src ), $image_edit_hash );

	/**
	 * Filters the maximum image width to be included in a 'srcset' attribute.
	 *
	 * @since 4.4.0
	 *
	 * @param int   $max_width  The maximum image width to be included in the 'srcset'. Default '2048'.
	 * @param int[] $size_array {
	 *     An array of requested width and height values.
	 *
	 *     @type int $0 The width in pixels.
	 *     @type int $1 The height in pixels.
	 * }
	 */
	$max_srcset_image_width = apply_filters( 'max_srcset_image_width', 2048, $size_array );

	// Array to hold URL candidates.
	$sources = array();

	/**
	 * To make sure the ID matches our image src, we will check to see if any sizes in our attachment
	 * meta match our $image_src. If no matches are found we don't return a srcset to avoid serving
	 * an incorrect image. See #35045.
	 */
	$src_matched = false;

	/*
	 * Loop through available images. Only use images that are resized
	 * versions of the same edit.
	 */
	foreach ( $image_sizes as $image ) {
		$is_src = false;

		// Check if image meta isn't corrupted.
		if ( ! is_array( $image ) ) {
			continue;
		}

		// If the file name is part of the `src`, we've confirmed a match.
		if ( ! $src_matched && false !== strpos( $image_src, $dirname . $image['file'] ) ) {
			$src_matched = true;
			$is_src      = true;
		}

		// Filter out images that are from previous edits.
		if ( $image_edited && ! strpos( $image['file'], $image_edit_hash[0] ) ) {
			continue;
		}

		/*
		 * Filters out images that are wider than '$max_srcset_image_width' unless
		 * that file is in the 'src' attribute.
		 */
		if ( $max_srcset_image_width && $image['width'] > $max_srcset_image_width && ! $is_src ) {
			continue;
		}

		// If the image dimensions are within 1px of the expected size, use it.
		if ( wp_image_matches_ratio( $image_width, $image_height, $image['width'], $image['height'] ) ) {
			// Add the URL, descriptor, and value to the sources array to be returned.
			$source = array(
				'url'        => $image_baseurl . $image['file'],
				'descriptor' => 'w',
				'value'      => $image['width'],
			);

			// The 'src' image has to be the first in the 'srcset', because of a bug in iOS8. See #35030.
			if ( $is_src ) {
				$sources = array( $image['width'] => $source ) + $sources;
			} else {
				$sources[ $image['width'] ] = $source;
			}
		}
	}

	/**
	 * Filters an image's 'srcset' sources.
	 *
	 * @since 4.4.0
	 *
	 * @param array  $sources {
	 *     One or more arrays of source data to include in the 'srcset'.
	 *
	 *     @type array $width {
	 *         @type string $url        The URL of an image source.
	 *         @type string $descriptor The descriptor type used in the image candidate string,
	 *                                  either 'w' or 'x'.
	 *         @type int    $value      The source width if paired with a 'w' descriptor, or a
	 *                                  pixel density value if paired with an 'x' descriptor.
	 *     }
	 * }
	 * @param array $size_array     {
	 *     An array of requested width and height values.
	 *
	 *     @type int $0 The width in pixels.
	 *     @type int $1 The height in pixels.
	 * }
	 * @param string $image_src     The 'src' of the image.
	 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
	 * @param int    $attachment_id Image attachment ID or 0.
	 */
	$sources = apply_filters( 'wp_calculate_image_srcset', $sources, $size_array, $image_src, $image_meta, $attachment_id );

	// Only return a 'srcset' value if there is more than one source.
	if ( ! $src_matched || ! is_array( $sources ) || count( $sources ) < 2 ) {
		return false;
	}

	$srcset = '';

	foreach ( $sources as $source ) {
		$srcset .= str_replace( ' ', '%20', $source['url'] ) . ' ' . $source['value'] . $source['descriptor'] . ', ';
	}

	return rtrim( $srcset, ', ' );
}

/**
 * Retrieves the value for an image attachment's 'sizes' attribute.
 *
 * @since 4.4.0
 *
 * @see wp_calculate_image_sizes()
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
 *                                    width and height values in pixels (in that order). Default 'medium'.
 * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
 *                                    Default null.
 * @return string|false A valid source size value for use in a 'sizes' attribute or false.
 */
function wp_get_attachment_image_sizes( $attachment_id, $size = 'medium', $image_meta = null ) {
	$image = wp_get_attachment_image_src( $attachment_id, $size );

	if ( ! $image ) {
		return false;
	}

	if ( ! is_array( $image_meta ) ) {
		$image_meta = wp_get_attachment_metadata( $attachment_id );
	}

	$image_src  = $image[0];
	$size_array = array(
		absint( $image[1] ),
		absint( $image[2] ),
	);

	return wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
}

/**
 * Creates a 'sizes' attribute value for an image.
 *
 * @since 4.4.0
 *
 * @param string|int[] $size          Image size. Accepts any registered image size name, or an array of
 *                                    width and height values in pixels (in that order).
 * @param string       $image_src     Optional. The URL to the image file. Default null.
 * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
 *                                    Default null.
 * @param int          $attachment_id Optional. Image attachment ID. Either `$image_meta` or `$attachment_id`
 *                                    is needed when using the image size name as argument for `$size`. Default 0.
 * @return string|false A valid source size value for use in a 'sizes' attribute or false.
 */
function wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null, $attachment_id = 0 ) {
	$width = 0;

	if ( is_array( $size ) ) {
		$width = absint( $size[0] );
	} elseif ( is_string( $size ) ) {
		if ( ! $image_meta && $attachment_id ) {
			$image_meta = wp_get_attachment_metadata( $attachment_id );
		}

		if ( is_array( $image_meta ) ) {
			$size_array = _wp_get_image_size_from_meta( $size, $image_meta );
			if ( $size_array ) {
				$width = absint( $size_array[0] );
			}
		}
	}

	if ( ! $width ) {
		return false;
	}

	// Setup the default 'sizes' attribute.
	$sizes = sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $width );

	/**
	 * Filters the output of 'wp_calculate_image_sizes()'.
	 *
	 * @since 4.4.0
	 *
	 * @param string       $sizes         A source size value for use in a 'sizes' attribute.
	 * @param string|int[] $size          Requested image size. Can be any registered image size name, or
	 *                                    an array of width and height values in pixels (in that order).
	 * @param string|null  $image_src     The URL to the image file or null.
	 * @param array|null   $image_meta    The image meta data as returned by wp_get_attachment_metadata() or null.
	 * @param int          $attachment_id Image attachment ID of the original image or 0.
	 */
	return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id );
}

/**
 * Determines if the image meta data is for the image source file.
 *
 * The image meta data is retrieved by attachment post ID. In some cases the post IDs may change.
 * For example when the website is exported and imported at another website. Then the
 * attachment post IDs that are in post_content for the exported website may not match
 * the same attachments at the new website.
 *
 * @since 5.5.0
 *
 * @param string $image_location The full path or URI to the image file.
 * @param array  $image_meta     The attachment meta data as returned by 'wp_get_attachment_metadata()'.
 * @param int    $attachment_id  Optional. The image attachment ID. Default 0.
 * @return bool Whether the image meta is for this image file.
 */
function wp_image_file_matches_image_meta( $image_location, $image_meta, $attachment_id = 0 ) {
	$match = false;

	// Ensure the $image_meta is valid.
	if ( isset( $image_meta['file'] ) && strlen( $image_meta['file'] ) > 4 ) {
		// Remove quiery args if image URI.
		list( $image_location ) = explode( '?', $image_location );

		// Check if the relative image path from the image meta is at the end of $image_location.
		if ( strrpos( $image_location, $image_meta['file'] ) === strlen( $image_location ) - strlen( $image_meta['file'] ) ) {
			$match = true;
		} else {
			// Retrieve the uploads sub-directory from the full size image.
			$dirname = _wp_get_attachment_relative_path( $image_meta['file'] );

			if ( $dirname ) {
				$dirname = trailingslashit( $dirname );
			}

			if ( ! empty( $image_meta['original_image'] ) ) {
				$relative_path = $dirname . $image_meta['original_image'];

				if ( strrpos( $image_location, $relative_path ) === strlen( $image_location ) - strlen( $relative_path ) ) {
					$match = true;
				}
			}

			if ( ! $match && ! empty( $image_meta['sizes'] ) ) {
				foreach ( $image_meta['sizes'] as $image_size_data ) {
					$relative_path = $dirname . $image_size_data['file'];

					if ( strrpos( $image_location, $relative_path ) === strlen( $image_location ) - strlen( $relative_path ) ) {
						$match = true;
						break;
					}
				}
			}
		}
	}

	/**
	 * Filters whether an image path or URI matches image meta.
	 *
	 * @since 5.5.0
	 *
	 * @param bool   $match          Whether the image relative path from the image meta
	 *                               matches the end of the URI or path to the image file.
	 * @param string $image_location Full path or URI to the tested image file.
	 * @param array  $image_meta     The image meta data as returned by 'wp_get_attachment_metadata()'.
	 * @param int    $attachment_id  The image attachment ID or 0 if not supplied.
	 */
	return apply_filters( 'wp_image_file_matches_image_meta', $match, $image_location, $image_meta, $attachment_id );
}

/**
 * Determines an image's width and height dimensions based on the source file.
 *
 * @since 5.5.0
 *
 * @param string $image_src     The image source file.
 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
 * @param int    $attachment_id Optional. The image attachment ID. Default 0.
 * @return array|false Array with first element being the width and second element being the height,
 *                     or false if dimensions cannot be determined.
 */
function wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id = 0 ) {
	$dimensions = false;

	// Is it a full size image?
	if (
		isset( $image_meta['file'] ) &&
		strpos( $image_src, wp_basename( $image_meta['file'] ) ) !== false
	) {
		$dimensions = array(
			(int) $image_meta['width'],
			(int) $image_meta['height'],
		);
	}

	if ( ! $dimensions && ! empty( $image_meta['sizes'] ) ) {
		$src_filename = wp_basename( $image_src );

		foreach ( $image_meta['sizes'] as $image_size_data ) {
			if ( $src_filename === $image_size_data['file'] ) {
				$dimensions = array(
					(int) $image_size_data['width'],
					(int) $image_size_data['height'],
				);

				break;
			}
		}
	}

	/**
	 * Filters the 'wp_image_src_get_dimensions' value.
	 *
	 * @since 5.7.0
	 *
	 * @param array|false $dimensions    Array with first element being the width
	 *                                   and second element being the height, or
	 *                                   false if dimensions could not be determined.
	 * @param string      $image_src     The image source file.
	 * @param array       $image_meta    The image meta data as returned by
	 *                                   'wp_get_attachment_metadata()'.
	 * @param int         $attachment_id The image attachment ID. Default 0.
	 */
	return apply_filters( 'wp_image_src_get_dimensions', $dimensions, $image_src, $image_meta, $attachment_id );
}

/**
 * Adds 'srcset' and 'sizes' attributes to an existing 'img' element.
 *
 * @since 4.4.0
 *
 * @see wp_calculate_image_srcset()
 * @see wp_calculate_image_sizes()
 *
 * @param string $image         An HTML 'img' element to be filtered.
 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
 * @param int    $attachment_id Image attachment ID.
 * @return string Converted 'img' element with 'srcset' and 'sizes' attributes added.
 */
function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
	// Ensure the image meta exists.
	if ( empty( $image_meta['sizes'] ) ) {
		return $image;
	}

	$image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
	list( $image_src ) = explode( '?', $image_src );

	// Return early if we couldn't get the image source.
	if ( ! $image_src ) {
		return $image;
	}

	// Bail early if an image has been inserted and later edited.
	if ( preg_match( '/-e[0-9]{13}/', $image_meta['file'], $img_edit_hash ) &&
		strpos( wp_basename( $image_src ), $img_edit_hash[0] ) === false ) {

		return $image;
	}

	$width  = preg_match( '/ width="([0-9]+)"/', $image, $match_width ) ? (int) $match_width[1] : 0;
	$height = preg_match( '/ height="([0-9]+)"/', $image, $match_height ) ? (int) $match_height[1] : 0;

	if ( $width && $height ) {
		$size_array = array( $width, $height );
	} else {
		$size_array = wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id );
		if ( ! $size_array ) {
			return $image;
		}
	}

	$srcset = wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );

	if ( $srcset ) {
		// Check if there is already a 'sizes' attribute.
		$sizes = strpos( $image, ' sizes=' );

		if ( ! $sizes ) {
			$sizes = wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
		}
	}

	if ( $srcset && $sizes ) {
		// Format the 'srcset' and 'sizes' string and escape attributes.
		$attr = sprintf( ' srcset="%s"', esc_attr( $srcset ) );

		if ( is_string( $sizes ) ) {
			$attr .= sprintf( ' sizes="%s"', esc_attr( $sizes ) );
		}

		// Add the srcset and sizes attributes to the image markup.
		return preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );
	}

	return $image;
}

/**
 * Determines whether to add the `loading` attribute to the specified tag in the specified context.
 *
 * @since 5.5.0
 * @since 5.7.0 Now returns `true` by default for `iframe` tags.
 *
 * @param string $tag_name The tag name.
 * @param string $context  Additional context, like the current filter name
 *                         or the function name from where this was called.
 * @return bool Whether to add the attribute.
 */
function wp_lazy_loading_enabled( $tag_name, $context ) {
	// By default add to all 'img' and 'iframe' tags.
	// See https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-loading
	// See https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-loading
	$default = ( 'img' === $tag_name || 'iframe' === $tag_name );

	/**
	 * Filters whether to add the `loading` attribute to the specified tag in the specified context.
	 *
	 * @since 5.5.0
	 *
	 * @param bool   $default  Default value.
	 * @param string $tag_name The tag name.
	 * @param string $context  Additional context, like the current filter name
	 *                         or the function name from where this was called.
	 */
	return (bool) apply_filters( 'wp_lazy_loading_enabled', $default, $tag_name, $context );
}

/**
 * Filters specific tags in post content and modifies their markup.
 *
 * Modifies HTML tags in post content to include new browser and HTML technologies
 * that may not have existed at the time of post creation. These modifications currently
 * include adding `srcset`, `sizes`, and `loading` attributes to `img` HTML tags, as well
 * as adding `loading` attributes to `iframe` HTML tags.
 * Future similar optimizations should be added/expected here.
 *
 * @since 5.5.0
 * @since 5.7.0 Now supports adding `loading` attributes to `iframe` tags.
 *
 * @see wp_img_tag_add_width_and_height_attr()
 * @see wp_img_tag_add_srcset_and_sizes_attr()
 * @see wp_img_tag_add_loading_attr()
 * @see wp_iframe_tag_add_loading_attr()
 *
 * @param string $content The HTML content to be filtered.
 * @param string $context Optional. Additional context to pass to the filters.
 *                        Defaults to `current_filter()` when not set.
 * @return string Converted content with images modified.
 */
function wp_filter_content_tags( $content, $context = null ) {
	if ( null === $context ) {
		$context = current_filter();
	}

	$add_img_loading_attr    = wp_lazy_loading_enabled( 'img', $context );
	$add_iframe_loading_attr = wp_lazy_loading_enabled( 'iframe', $context );

	if ( ! preg_match_all( '/<(img|iframe)\s[^>]+>/', $content, $matches, PREG_SET_ORDER ) ) {
		return $content;
	}

	// List of the unique `img` tags found in $content.
	$images = array();

	// List of the unique `iframe` tags found in $content.
	$iframes = array();

	foreach ( $matches as $match ) {
		list( $tag, $tag_name ) = $match;

		switch ( $tag_name ) {
			case 'img':
				if ( preg_match( '/wp-image-([0-9]+)/i', $tag, $class_id ) ) {
					$attachment_id = absint( $class_id[1] );

					if ( $attachment_id ) {
						// If exactly the same image tag is used more than once, overwrite it.
						// All identical tags will be replaced later with 'str_replace()'.
						$images[ $tag ] = $attachment_id;
						break;
					}
				}
				$images[ $tag ] = 0;
				break;
			case 'iframe':
				$iframes[ $tag ] = 0;
				break;
		}
	}

	// Reduce the array to unique attachment IDs.
	$attachment_ids = array_unique( array_filter( array_values( $images ) ) );

	if ( count( $attachment_ids ) > 1 ) {
		/*
		 * Warm the object cache with post and meta information for all found
		 * images to avoid making individual database calls.
		 */
		_prime_post_caches( $attachment_ids, false, true );
	}

	// Iterate through the matches in order of occurrence as it is relevant for whether or not to lazy-load.
	foreach ( $matches as $match ) {
		// Filter an image match.
		if ( isset( $images[ $match[0] ] ) ) {
			$filtered_image = $match[0];
			$attachment_id  = $images[ $match[0] ];

			// Add 'width' and 'height' attributes if applicable.
			if ( $attachment_id > 0 && false === strpos( $filtered_image, ' width=' ) && false === strpos( $filtered_image, ' height=' ) ) {
				$filtered_image = wp_img_tag_add_width_and_height_attr( $filtered_image, $context, $attachment_id );
			}

			// Add 'srcset' and 'sizes' attributes if applicable.
			if ( $attachment_id > 0 && false === strpos( $filtered_image, ' srcset=' ) ) {
				$filtered_image = wp_img_tag_add_srcset_and_sizes_attr( $filtered_image, $context, $attachment_id );
			}

			// Add 'loading' attribute if applicable.
			if ( $add_img_loading_attr && false === strpos( $filtered_image, ' loading=' ) ) {
				$filtered_image = wp_img_tag_add_loading_attr( $filtered_image, $context );
			}

			if ( $filtered_image !== $match[0] ) {
				$content = str_replace( $match[0], $filtered_image, $content );
			}
		}

		// Filter an iframe match.
		if ( isset( $iframes[ $match[0] ] ) ) {
			$filtered_iframe = $match[0];

			// Add 'loading' attribute if applicable.
			if ( $add_iframe_loading_attr && false === strpos( $filtered_iframe, ' loading=' ) ) {
				$filtered_iframe = wp_iframe_tag_add_loading_attr( $filtered_iframe, $context );
			}

			if ( $filtered_iframe !== $match[0] ) {
				$content = str_replace( $match[0], $filtered_iframe, $content );
			}
		}
	}

	return $content;
}

/**
 * Adds `loading` attribute to an `img` HTML tag.
 *
 * @since 5.5.0
 *
 * @param string $image   The HTML `img` tag where the attribute should be added.
 * @param string $context Additional context to pass to the filters.
 * @return string Converted `img` tag with `loading` attribute added.
 */
function wp_img_tag_add_loading_attr( $image, $context ) {
	// Get loading attribute value to use. This must occur before the conditional check below so that even images that
	// are ineligible for being lazy-loaded are considered.
	$value = wp_get_loading_attr_default( $context );

	// Images should have source and dimension attributes for the `loading` attribute to be added.
	if ( false === strpos( $image, ' src="' ) || false === strpos( $image, ' width="' ) || false === strpos( $image, ' height="' ) ) {
		return $image;
	}

	/**
	 * Filters the `loading` attribute value to add to an image. Default `lazy`.
	 *
	 * Returning `false` or an empty string will not add the attribute.
	 * Returning `true` will add the default value.
	 *
	 * @since 5.5.0
	 *
	 * @param string|bool $value   The `loading` attribute value. Returning a falsey value will result in
	 *                             the attribute being omitted for the image.
	 * @param string      $image   The HTML `img` tag to be filtered.
	 * @param string      $context Additional context about how the function was called or where the img tag is.
	 */
	$value = apply_filters( 'wp_img_tag_add_loading_attr', $value, $image, $context );

	if ( $value ) {
		if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) {
			$value = 'lazy';
		}

		return str_replace( '<img', '<img loading="' . esc_attr( $value ) . '"', $image );
	}

	return $image;
}

/**
 * Adds `width` and `height` attributes to an `img` HTML tag.
 *
 * @since 5.5.0
 *
 * @param string $image         The HTML `img` tag where the attribute should be added.
 * @param string $context       Additional context to pass to the filters.
 * @param int    $attachment_id Image attachment ID.
 * @return string Converted 'img' element with 'width' and 'height' attributes added.
 */
function wp_img_tag_add_width_and_height_attr( $image, $context, $attachment_id ) {
	$image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
	list( $image_src ) = explode( '?', $image_src );

	// Return early if we couldn't get the image source.
	if ( ! $image_src ) {
		return $image;
	}

	/**
	 * Filters whether to add the missing `width` and `height` HTML attributes to the img tag. Default `true`.
	 *
	 * Returning anything else than `true` will not add the attributes.
	 *
	 * @since 5.5.0
	 *
	 * @param bool   $value         The filtered value, defaults to `true`.
	 * @param string $image         The HTML `img` tag where the attribute should be added.
	 * @param string $context       Additional context about how the function was called or where the img tag is.
	 * @param int    $attachment_id The image attachment ID.
	 */
	$add = apply_filters( 'wp_img_tag_add_width_and_height_attr', true, $image, $context, $attachment_id );

	if ( true === $add ) {
		$image_meta = wp_get_attachment_metadata( $attachment_id );
		$size_array = wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id );

		if ( $size_array ) {
			$hw = trim( image_hwstring( $size_array[0], $size_array[1] ) );
			return str_replace( '<img', "<img {$hw}", $image );
		}
	}

	return $image;
}

/**
 * Adds `srcset` and `sizes` attributes to an existing `img` HTML tag.
 *
 * @since 5.5.0
 *
 * @param string $image         The HTML `img` tag where the attribute should be added.
 * @param string $context       Additional context to pass to the filters.
 * @param int    $attachment_id Image attachment ID.
 * @return string Converted 'img' element with 'loading' attribute added.
 */
function wp_img_tag_add_srcset_and_sizes_attr( $image, $context, $attachment_id ) {
	/**
	 * Filters whether to add the `srcset` and `sizes` HTML attributes to the img tag. Default `true`.
	 *
	 * Returning anything else than `true` will not add the attributes.
	 *
	 * @since 5.5.0
	 *
	 * @param bool   $value         The filtered value, defaults to `true`.
	 * @param string $image         The HTML `img` tag where the attribute should be added.
	 * @param string $context       Additional context about how the function was called or where the img tag is.
	 * @param int    $attachment_id The image attachment ID.
	 */
	$add = apply_filters( 'wp_img_tag_add_srcset_and_sizes_attr', true, $image, $context, $attachment_id );

	if ( true === $add ) {
		$image_meta = wp_get_attachment_metadata( $attachment_id );
		return wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id );
	}

	return $image;
}

/**
 * Adds `loading` attribute to an `iframe` HTML tag.
 *
 * @since 5.7.0
 *
 * @param string $iframe  The HTML `iframe` tag where the attribute should be added.
 * @param string $context Additional context to pass to the filters.
 * @return string Converted `iframe` tag with `loading` attribute added.
 */
function wp_iframe_tag_add_loading_attr( $iframe, $context ) {
	// Iframes with fallback content (see `wp_filter_oembed_result()`) should not be lazy-loaded because they are
	// visually hidden initially.
	if ( false !== strpos( $iframe, ' data-secret="' ) ) {
		return $iframe;
	}

	// Get loading attribute value to use. This must occur before the conditional check below so that even iframes that
	// are ineligible for being lazy-loaded are considered.
	$value = wp_get_loading_attr_default( $context );

	// Iframes should have source and dimension attributes for the `loading` attribute to be added.
	if ( false === strpos( $iframe, ' src="' ) || false === strpos( $iframe, ' width="' ) || false === strpos( $iframe, ' height="' ) ) {
		return $iframe;
	}

	/**
	 * Filters the `loading` attribute value to add to an iframe. Default `lazy`.
	 *
	 * Returning `false` or an empty string will not add the attribute.
	 * Returning `true` will add the default value.
	 *
	 * @since 5.7.0
	 *
	 * @param string|bool $value   The `loading` attribute value. Returning a falsey value will result in
	 *                             the attribute being omitted for the iframe.
	 * @param string      $iframe  The HTML `iframe` tag to be filtered.
	 * @param string      $context Additional context about how the function was called or where the iframe tag is.
	 */
	$value = apply_filters( 'wp_iframe_tag_add_loading_attr', $value, $iframe, $context );

	if ( $value ) {
		if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) {
			$value = 'lazy';
		}

		return str_replace( '<iframe', '<iframe loading="' . esc_attr( $value ) . '"', $iframe );
	}

	return $iframe;
}

/**
 * Adds a 'wp-post-image' class to post thumbnails. Internal use only.
 *
 * Uses the {@see 'begin_fetch_post_thumbnail_html'} and {@see 'end_fetch_post_thumbnail_html'}
 * action hooks to dynamically add/remove itself so as to only filter post thumbnails.
 *
 * @ignore
 * @since 2.9.0
 *
 * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
 * @return string[] Modified array of attributes including the new 'wp-post-image' class.
 */
function _wp_post_thumbnail_class_filter( $attr ) {
	$attr['class'] .= ' wp-post-image';
	return $attr;
}

/**
 * Adds '_wp_post_thumbnail_class_filter' callback to the 'wp_get_attachment_image_attributes'
 * filter hook. Internal use only.
 *
 * @ignore
 * @since 2.9.0
 *
 * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
 */
function _wp_post_thumbnail_class_filter_add( $attr ) {
	add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
}

/**
 * Removes the '_wp_post_thumbnail_class_filter' callback from the 'wp_get_attachment_image_attributes'
 * filter hook. Internal use only.
 *
 * @ignore
 * @since 2.9.0
 *
 * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
 */
function _wp_post_thumbnail_class_filter_remove( $attr ) {
	remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
}

add_shortcode( 'wp_caption', 'img_caption_shortcode' );
add_shortcode( 'caption', 'img_caption_shortcode' );

/**
 * Builds the Caption shortcode output.
 *
 * Allows a plugin to replace the content that would otherwise be returned. The
 * filter is {@see 'img_caption_shortcode'} and passes an empty string, the attr
 * parameter and the content parameter values.
 *
 * The supported attributes for the shortcode are 'id', 'caption_id', 'align',
 * 'width', 'caption', and 'class'.
 *
 * @since 2.6.0
 * @since 3.9.0 The `class` attribute was added.
 * @since 5.1.0 The `caption_id` attribute was added.
 * @since 5.9.0 The `$content` parameter default value changed from `null` to `''`.
 *
 * @param array  $attr {
 *     Attributes of the caption shortcode.
 *
 *     @type string $id         ID of the image and caption container element, i.e. `<figure>` or `<div>`.
 *     @type string $caption_id ID of the caption element, i.e. `<figcaption>` or `<p>`.
 *     @type string $align      Class name that aligns the caption. Default 'alignnone'. Accepts 'alignleft',
 *                              'aligncenter', alignright', 'alignnone'.
 *     @type int    $width      The width of the caption, in pixels.
 *     @type string $caption    The caption text.
 *     @type string $class      Additional class name(s) added to the caption container.
 * }
 * @param string $content Optional. Shortcode content. Default empty string.
 * @return string HTML content to display the caption.
 */
function img_caption_shortcode( $attr, $content = '' ) {
	// New-style shortcode with the caption inside the shortcode with the link and image tags.
	if ( ! isset( $attr['caption'] ) ) {
		if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {
			$content         = $matches[1];
			$attr['caption'] = trim( $matches[2] );
		}
	} elseif ( strpos( $attr['caption'], '<' ) !== false ) {
		$attr['caption'] = wp_kses( $attr['caption'], 'post' );
	}

	/**
	 * Filters the default caption shortcode output.
	 *
	 * If the filtered output isn't empty, it will be used instead of generating
	 * the default caption template.
	 *
	 * @since 2.6.0
	 *
	 * @see img_caption_shortcode()
	 *
	 * @param string $output  The caption output. Default empty.
	 * @param array  $attr    Attributes of the caption shortcode.
	 * @param string $content The image element, possibly wrapped in a hyperlink.
	 */
	$output = apply_filters( 'img_caption_shortcode', '', $attr, $content );

	if ( ! empty( $output ) ) {
		return $output;
	}

	$atts = shortcode_atts(
		array(
			'id'         => '',
			'caption_id' => '',
			'align'      => 'alignnone',
			'width'      => '',
			'caption'    => '',
			'class'      => '',
		),
		$attr,
		'caption'
	);

	$atts['width'] = (int) $atts['width'];

	if ( $atts['width'] < 1 || empty( $atts['caption'] ) ) {
		return $content;
	}

	$id          = '';
	$caption_id  = '';
	$describedby = '';

	if ( $atts['id'] ) {
		$atts['id'] = sanitize_html_class( $atts['id'] );
		$id         = 'id="' . esc_attr( $atts['id'] ) . '" ';
	}

	if ( $atts['caption_id'] ) {
		$atts['caption_id'] = sanitize_html_class( $atts['caption_id'] );
	} elseif ( $atts['id'] ) {
		$atts['caption_id'] = 'caption-' . str_replace( '_', '-', $atts['id'] );
	}

	if ( $atts['caption_id'] ) {
		$caption_id  = 'id="' . esc_attr( $atts['caption_id'] ) . '" ';
		$describedby = 'aria-describedby="' . esc_attr( $atts['caption_id'] ) . '" ';
	}

	$class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );

	$html5 = current_theme_supports( 'html5', 'caption' );
	// HTML5 captions never added the extra 10px to the image width.
	$width = $html5 ? $atts['width'] : ( 10 + $atts['width'] );

	/**
	 * Filters the width of an image's caption.
	 *
	 * By default, the caption is 10 pixels greater than the width of the image,
	 * to prevent post content from running up against a floated image.
	 *
	 * @since 3.7.0
	 *
	 * @see img_caption_shortcode()
	 *
	 * @param int    $width    Width of the caption in pixels. To remove this inline style,
	 *                         return zero.
	 * @param array  $atts     Attributes of the caption shortcode.
	 * @param string $content  The image element, possibly wrapped in a hyperlink.
	 */
	$caption_width = apply_filters( 'img_caption_shortcode_width', $width, $atts, $content );

	$style = '';

	if ( $caption_width ) {
		$style = 'style="width: ' . (int) $caption_width . 'px" ';
	}

	if ( $html5 ) {
		$html = sprintf(
			'<figure %s%s%sclass="%s">%s%s</figure>',
			$id,
			$describedby,
			$style,
			esc_attr( $class ),
			do_shortcode( $content ),
			sprintf(
				'<figcaption %sclass="wp-caption-text">%s</figcaption>',
				$caption_id,
				$atts['caption']
			)
		);
	} else {
		$html = sprintf(
			'<div %s%sclass="%s">%s%s</div>',
			$id,
			$style,
			esc_attr( $class ),
			str_replace( '<img ', '<img ' . $describedby, do_shortcode( $content ) ),
			sprintf(
				'<p %sclass="wp-caption-text">%s</p>',
				$caption_id,
				$atts['caption']
			)
		);
	}

	return $html;
}

add_shortcode( 'gallery', 'gallery_shortcode' );

/**
 * Builds the Gallery shortcode output.
 *
 * This implements the functionality of the Gallery Shortcode for displaying
 * WordPress images on a post.
 *
 * @since 2.5.0
 *
 * @param array $attr {
 *     Attributes of the gallery shortcode.
 *
 *     @type string       $order      Order of the images in the gallery. Default 'ASC'. Accepts 'ASC', 'DESC'.
 *     @type string       $orderby    The field to use when ordering the images. Default 'menu_order ID'.
 *                                    Accepts any valid SQL ORDERBY statement.
 *     @type int          $id         Post ID.
 *     @type string       $itemtag    HTML tag to use for each image in the gallery.
 *                                    Default 'dl', or 'figure' when the theme registers HTML5 gallery support.
 *     @type string       $icontag    HTML tag to use for each image's icon.
 *                                    Default 'dt', or 'div' when the theme registers HTML5 gallery support.
 *     @type string       $captiontag HTML tag to use for each image's caption.
 *                                    Default 'dd', or 'figcaption' when the theme registers HTML5 gallery support.
 *     @type int          $columns    Number of columns of images to display. Default 3.
 *     @type string|int[] $size       Size of the images to display. Accepts any registered image size name, or an array
 *                                    of width and height values in pixels (in that order). Default 'thumbnail'.
 *     @type string       $ids        A comma-separated list of IDs of attachments to display. Default empty.
 *     @type string       $include    A comma-separated list of IDs of attachments to include. Default empty.
 *     @type string       $exclude    A comma-separated list of IDs of attachments to exclude. Default empty.
 *     @type string       $link       What to link each image to. Default empty (links to the attachment page).
 *                                    Accepts 'file', 'none'.
 * }
 * @return string HTML content to display gallery.
 */
function gallery_shortcode( $attr ) {
	$post = get_post();

	static $instance = 0;
	$instance++;

	if ( ! empty( $attr['ids'] ) ) {
		// 'ids' is explicitly ordered, unless you specify otherwise.
		if ( empty( $attr['orderby'] ) ) {
			$attr['orderby'] = 'post__in';
		}
		$attr['include'] = $attr['ids'];
	}

	/**
	 * Filters the default gallery shortcode output.
	 *
	 * If the filtered output isn't empty, it will be used instead of generating
	 * the default gallery template.
	 *
	 * @since 2.5.0
	 * @since 4.2.0 The `$instance` parameter was added.
	 *
	 * @see gallery_shortcode()
	 *
	 * @param string $output   The gallery output. Default empty.
	 * @param array  $attr     Attributes of the gallery shortcode.
	 * @param int    $instance Unique numeric ID of this gallery shortcode instance.
	 */
	$output = apply_filters( 'post_gallery', '', $attr, $instance );

	if ( ! empty( $output ) ) {
		return $output;
	}

	$html5 = current_theme_supports( 'html5', 'gallery' );
	$atts  = shortcode_atts(
		array(
			'order'      => 'ASC',
			'orderby'    => 'menu_order ID',
			'id'         => $post ? $post->ID : 0,
			'itemtag'    => $html5 ? 'figure' : 'dl',
			'icontag'    => $html5 ? 'div' : 'dt',
			'captiontag' => $html5 ? 'figcaption' : 'dd',
			'columns'    => 3,
			'size'       => 'thumbnail',
			'include'    => '',
			'exclude'    => '',
			'link'       => '',
		),
		$attr,
		'gallery'
	);

	$id = (int) $atts['id'];

	if ( ! empty( $atts['include'] ) ) {
		$_attachments = get_posts(
			array(
				'include'        => $atts['include'],
				'post_status'    => 'inherit',
				'post_type'      => 'attachment',
				'post_mime_type' => 'image',
				'order'          => $atts['order'],
				'orderby'        => $atts['orderby'],
			)
		);

		$attachments = array();
		foreach ( $_attachments as $key => $val ) {
			$attachments[ $val->ID ] = $_attachments[ $key ];
		}
	} elseif ( ! empty( $atts['exclude'] ) ) {
		$attachments = get_children(
			array(
				'post_parent'    => $id,
				'exclude'        => $atts['exclude'],
				'post_status'    => 'inherit',
				'post_type'      => 'attachment',
				'post_mime_type' => 'image',
				'order'          => $atts['order'],
				'orderby'        => $atts['orderby'],
			)
		);
	} else {
		$attachments = get_children(
			array(
				'post_parent'    => $id,
				'post_status'    => 'inherit',
				'post_type'      => 'attachment',
				'post_mime_type' => 'image',
				'order'          => $atts['order'],
				'orderby'        => $atts['orderby'],
			)
		);
	}

	if ( empty( $attachments ) ) {
		return '';
	}

	if ( is_feed() ) {
		$output = "\n";
		foreach ( $attachments as $att_id => $attachment ) {
			if ( ! empty( $atts['link'] ) ) {
				if ( 'none' === $atts['link'] ) {
					$output .= wp_get_attachment_image( $att_id, $atts['size'], false, $attr );
				} else {
					$output .= wp_get_attachment_link( $att_id, $atts['size'], false );
				}
			} else {
				$output .= wp_get_attachment_link( $att_id, $atts['size'], true );
			}
			$output .= "\n";
		}
		return $output;
	}

	$itemtag    = tag_escape( $atts['itemtag'] );
	$captiontag = tag_escape( $atts['captiontag'] );
	$icontag    = tag_escape( $atts['icontag'] );
	$valid_tags = wp_kses_allowed_html( 'post' );
	if ( ! isset( $valid_tags[ $itemtag ] ) ) {
		$itemtag = 'dl';
	}
	if ( ! isset( $valid_tags[ $captiontag ] ) ) {
		$captiontag = 'dd';
	}
	if ( ! isset( $valid_tags[ $icontag ] ) ) {
		$icontag = 'dt';
	}

	$columns   = (int) $atts['columns'];
	$itemwidth = $columns > 0 ? floor( 100 / $columns ) : 100;
	$float     = is_rtl() ? 'right' : 'left';

	$selector = "gallery-{$instance}";

	$gallery_style = '';

	/**
	 * Filters whether to print default gallery styles.
	 *
	 * @since 3.1.0
	 *
	 * @param bool $print Whether to print default gallery styles.
	 *                    Defaults to false if the theme supports HTML5 galleries.
	 *                    Otherwise, defaults to true.
	 */
	if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
		$type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';

		$gallery_style = "
		<style{$type_attr}>
			#{$selector} {
				margin: auto;
			}
			#{$selector} .gallery-item {
				float: {$float};
				margin-top: 10px;
				text-align: center;
				width: {$itemwidth}%;
			}
			#{$selector} img {
				border: 2px solid #cfcfcf;
			}
			#{$selector} .gallery-caption {
				margin-left: 0;
			}
			/* see gallery_shortcode() in wp-includes/media.php */
		</style>\n\t\t";
	}

	$size_class  = sanitize_html_class( is_array( $atts['size'] ) ? implode( 'x', $atts['size'] ) : $atts['size'] );
	$gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";

	/**
	 * Filters the default gallery shortcode CSS styles.
	 *
	 * @since 2.5.0
	 *
	 * @param string $gallery_style Default CSS styles and opening HTML div container
	 *                              for the gallery shortcode output.
	 */
	$output = apply_filters( 'gallery_style', $gallery_style . $gallery_div );

	$i = 0;

	foreach ( $attachments as $id => $attachment ) {

		$attr = ( trim( $attachment->post_excerpt ) ) ? array( 'aria-describedby' => "$selector-$id" ) : '';

		if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) {
			$image_output = wp_get_attachment_link( $id, $atts['size'], false, false, false, $attr );
		} elseif ( ! empty( $atts['link'] ) && 'none' === $atts['link'] ) {
			$image_output = wp_get_attachment_image( $id, $atts['size'], false, $attr );
		} else {
			$image_output = wp_get_attachment_link( $id, $atts['size'], true, false, false, $attr );
		}

		$image_meta = wp_get_attachment_metadata( $id );

		$orientation = '';

		if ( isset( $image_meta['height'], $image_meta['width'] ) ) {
			$orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';
		}

		$output .= "<{$itemtag} class='gallery-item'>";
		$output .= "
			<{$icontag} class='gallery-icon {$orientation}'>
				$image_output
			</{$icontag}>";

		if ( $captiontag && trim( $attachment->post_excerpt ) ) {
			$output .= "
				<{$captiontag} class='wp-caption-text gallery-caption' id='$selector-$id'>
				" . wptexturize( $attachment->post_excerpt ) . "
				</{$captiontag}>";
		}

		$output .= "</{$itemtag}>";

		if ( ! $html5 && $columns > 0 && 0 === ++$i % $columns ) {
			$output .= '<br style="clear: both" />';
		}
	}

	if ( ! $html5 && $columns > 0 && 0 !== $i % $columns ) {
		$output .= "
			<br style='clear: both' />";
	}

	$output .= "
		</div>\n";

	return $output;
}

/**
 * Outputs the templates used by playlists.
 *
 * @since 3.9.0
 */
function wp_underscore_playlist_templates() {
	?>
<script type="text/html" id="tmpl-wp-playlist-current-item">
	<# if ( data.thumb && data.thumb.src ) { #>
		<img src="{{ data.thumb.src }}" alt="" />
	<# } #>
	<div class="wp-playlist-caption">
		<span class="wp-playlist-item-meta wp-playlist-item-title">
		<?php
			/* translators: %s: Playlist item title. */
			printf( _x( '&#8220;%s&#8221;', 'playlist item title' ), '{{ data.title }}' );
		?>
		</span>
		<# if ( data.meta.album ) { #><span class="wp-playlist-item-meta wp-playlist-item-album">{{ data.meta.album }}</span><# } #>
		<# if ( data.meta.artist ) { #><span class="wp-playlist-item-meta wp-playlist-item-artist">{{ data.meta.artist }}</span><# } #>
	</div>
</script>
<script type="text/html" id="tmpl-wp-playlist-item">
	<div class="wp-playlist-item">
		<a class="wp-playlist-caption" href="{{ data.src }}">
			{{ data.index ? ( data.index + '. ' ) : '' }}
			<# if ( data.caption ) { #>
				{{ data.caption }}
			<# } else { #>
				<span class="wp-playlist-item-title">
				<?php
					/* translators: %s: Playlist item title. */
					printf( _x( '&#8220;%s&#8221;', 'playlist item title' ), '{{{ data.title }}}' );
				?>
				</span>
				<# if ( data.artists && data.meta.artist ) { #>
				<span class="wp-playlist-item-artist"> &mdash; {{ data.meta.artist }}</span>
				<# } #>
			<# } #>
		</a>
		<# if ( data.meta.length_formatted ) { #>
		<div class="wp-playlist-item-length">{{ data.meta.length_formatted }}</div>
		<# } #>
	</div>
</script>
	<?php
}

/**
 * Outputs and enqueue default scripts and styles for playlists.
 *
 * @since 3.9.0
 *
 * @param string $type Type of playlist. Accepts 'audio' or 'video'.
 */
function wp_playlist_scripts( $type ) {
	wp_enqueue_style( 'wp-mediaelement' );
	wp_enqueue_script( 'wp-playlist' );
	?>
<!--[if lt IE 9]><script>document.createElement('<?php echo esc_js( $type ); ?>');</script><![endif]-->
	<?php
	add_action( 'wp_footer', 'wp_underscore_playlist_templates', 0 );
	add_action( 'admin_footer', 'wp_underscore_playlist_templates', 0 );
}

/**
 * Builds the Playlist shortcode output.
 *
 * This implements the functionality of the playlist shortcode for displaying
 * a collection of WordPress audio or video files in a post.
 *
 * @since 3.9.0
 *
 * @global int $content_width
 *
 * @param array $attr {
 *     Array of default playlist attributes.
 *
 *     @type string  $type         Type of playlist to display. Accepts 'audio' or 'video'. Default 'audio'.
 *     @type string  $order        Designates ascending or descending order of items in the playlist.
 *                                 Accepts 'ASC', 'DESC'. Default 'ASC'.
 *     @type string  $orderby      Any column, or columns, to sort the playlist. If $ids are
 *                                 passed, this defaults to the order of the $ids array ('post__in').
 *                                 Otherwise default is 'menu_order ID'.
 *     @type int     $id           If an explicit $ids array is not present, this parameter
 *                                 will determine which attachments are used for the playlist.
 *                                 Default is the current post ID.
 *     @type array   $ids          Create a playlist out of these explicit attachment IDs. If empty,
 *                                 a playlist will be created from all $type attachments of $id.
 *                                 Default empty.
 *     @type array   $exclude      List of specific attachment IDs to exclude from the playlist. Default empty.
 *     @type string  $style        Playlist style to use. Accepts 'light' or 'dark'. Default 'light'.
 *     @type bool    $tracklist    Whether to show or hide the playlist. Default true.
 *     @type bool    $tracknumbers Whether to show or hide the numbers next to entries in the playlist. Default true.
 *     @type bool    $images       Show or hide the video or audio thumbnail (Featured Image/post
 *                                 thumbnail). Default true.
 *     @type bool    $artists      Whether to show or hide artist name in the playlist. Default true.
 * }
 *
 * @return string Playlist output. Empty string if the passed type is unsupported.
 */
function wp_playlist_shortcode( $attr ) {
	global $content_width;
	$post = get_post();

	static $instance = 0;
	$instance++;

	if ( ! empty( $attr['ids'] ) ) {
		// 'ids' is explicitly ordered, unless you specify otherwise.
		if ( empty( $attr['orderby'] ) ) {
			$attr['orderby'] = 'post__in';
		}
		$attr['include'] = $attr['ids'];
	}

	/**
	 * Filters the playlist output.
	 *
	 * Returning a non-empty value from the filter will short-circuit generation
	 * of the default playlist output, returning the passed value instead.
	 *
	 * @since 3.9.0
	 * @since 4.2.0 The `$instance` parameter was added.
	 *
	 * @param string $output   Playlist output. Default empty.
	 * @param array  $attr     An array of shortcode attributes.
	 * @param int    $instance Unique numeric ID of this playlist shortcode instance.
	 */
	$output = apply_filters( 'post_playlist', '', $attr, $instance );

	if ( ! empty( $output ) ) {
		return $output;
	}

	$atts = shortcode_atts(
		array(
			'type'         => 'audio',
			'order'        => 'ASC',
			'orderby'      => 'menu_order ID',
			'id'           => $post ? $post->ID : 0,
			'include'      => '',
			'exclude'      => '',
			'style'        => 'light',
			'tracklist'    => true,
			'tracknumbers' => true,
			'images'       => true,
			'artists'      => true,
		),
		$attr,
		'playlist'
	);

	$id = (int) $atts['id'];

	if ( 'audio' !== $atts['type'] ) {
		$atts['type'] = 'video';
	}

	$args = array(
		'post_status'    => 'inherit',
		'post_type'      => 'attachment',
		'post_mime_type' => $atts['type'],
		'order'          => $atts['order'],
		'orderby'        => $atts['orderby'],
	);

	if ( ! empty( $atts['include'] ) ) {
		$args['include'] = $atts['include'];
		$_attachments    = get_posts( $args );

		$attachments = array();
		foreach ( $_attachments as $key => $val ) {
			$attachments[ $val->ID ] = $_attachments[ $key ];
		}
	} elseif ( ! empty( $atts['exclude'] ) ) {
		$args['post_parent'] = $id;
		$args['exclude']     = $atts['exclude'];
		$attachments         = get_children( $args );
	} else {
		$args['post_parent'] = $id;
		$attachments         = get_children( $args );
	}

	if ( empty( $attachments ) ) {
		return '';
	}

	if ( is_feed() ) {
		$output = "\n";
		foreach ( $attachments as $att_id => $attachment ) {
			$output .= wp_get_attachment_link( $att_id ) . "\n";
		}
		return $output;
	}

	$outer = 22; // Default padding and border of wrapper.

	$default_width  = 640;
	$default_height = 360;

	$theme_width  = empty( $content_width ) ? $default_width : ( $content_width - $outer );
	$theme_height = empty( $content_width ) ? $default_height : round( ( $default_height * $theme_width ) / $default_width );

	$data = array(
		'type'         => $atts['type'],
		// Don't pass strings to JSON, will be truthy in JS.
		'tracklist'    => wp_validate_boolean( $atts['tracklist'] ),
		'tracknumbers' => wp_validate_boolean( $atts['tracknumbers'] ),
		'images'       => wp_validate_boolean( $atts['images'] ),
		'artists'      => wp_validate_boolean( $atts['artists'] ),
	);

	$tracks = array();
	foreach ( $attachments as $attachment ) {
		$url   = wp_get_attachment_url( $attachment->ID );
		$ftype = wp_check_filetype( $url, wp_get_mime_types() );
		$track = array(
			'src'         => $url,
			'type'        => $ftype['type'],
			'title'       => $attachment->post_title,
			'caption'     => $attachment->post_excerpt,
			'description' => $attachment->post_content,
		);

		$track['meta'] = array();
		$meta          = wp_get_attachment_metadata( $attachment->ID );
		if ( ! empty( $meta ) ) {

			foreach ( wp_get_attachment_id3_keys( $attachment ) as $key => $label ) {
				if ( ! empty( $meta[ $key ] ) ) {
					$track['meta'][ $key ] = $meta[ $key ];
				}
			}

			if ( 'video' === $atts['type'] ) {
				if ( ! empty( $meta['width'] ) && ! empty( $meta['height'] ) ) {
					$width        = $meta['width'];
					$height       = $meta['height'];
					$theme_height = round( ( $height * $theme_width ) / $width );
				} else {
					$width  = $default_width;
					$height = $default_height;
				}

				$track['dimensions'] = array(
					'original' => compact( 'width', 'height' ),
					'resized'  => array(
						'width'  => $theme_width,
						'height' => $theme_height,
					),
				);
			}
		}

		if ( $atts['images'] ) {
			$thumb_id = get_post_thumbnail_id( $attachment->ID );
			if ( ! empty( $thumb_id ) ) {
				list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'full' );
				$track['image']               = compact( 'src', 'width', 'height' );
				list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'thumbnail' );
				$track['thumb']               = compact( 'src', 'width', 'height' );
			} else {
				$src            = wp_mime_type_icon( $attachment->ID );
				$width          = 48;
				$height         = 64;
				$track['image'] = compact( 'src', 'width', 'height' );
				$track['thumb'] = compact( 'src', 'width', 'height' );
			}
		}

		$tracks[] = $track;
	}
	$data['tracks'] = $tracks;

	$safe_type  = esc_attr( $atts['type'] );
	$safe_style = esc_attr( $atts['style'] );

	ob_start();

	if ( 1 === $instance ) {
		/**
		 * Prints and enqueues playlist scripts, styles, and JavaScript templates.
		 *
		 * @since 3.9.0
		 *
		 * @param string $type  Type of playlist. Possible values are 'audio' or 'video'.
		 * @param string $style The 'theme' for the playlist. Core provides 'light' and 'dark'.
		 */
		do_action( 'wp_playlist_scripts', $atts['type'], $atts['style'] );
	}
	?>
<div class="wp-playlist wp-<?php echo $safe_type; ?>-playlist wp-playlist-<?php echo $safe_style; ?>">
	<?php if ( 'audio' === $atts['type'] ) : ?>
		<div class="wp-playlist-current-item"></div>
	<?php endif; ?>
	<<?php echo $safe_type; ?> controls="controls" preload="none" width="<?php echo (int) $theme_width; ?>"
		<?php
		if ( 'video' === $safe_type ) {
			echo ' height="', (int) $theme_height, '"';
		}
		?>
	></<?php echo $safe_type; ?>>
	<div class="wp-playlist-next"></div>
	<div class="wp-playlist-prev"></div>
	<noscript>
	<ol>
		<?php
		foreach ( $attachments as $att_id => $attachment ) {
			printf( '<li>%s</li>', wp_get_attachment_link( $att_id ) );
		}
		?>
	</ol>
	</noscript>
	<script type="application/json" class="wp-playlist-script"><?php echo wp_json_encode( $data ); ?></script>
</div>
	<?php
	return ob_get_clean();
}
add_shortcode( 'playlist', 'wp_playlist_shortcode' );

/**
 * Provides a No-JS Flash fallback as a last resort for audio / video.
 *
 * @since 3.6.0
 *
 * @param string $url The media element URL.
 * @return string Fallback HTML.
 */
function wp_mediaelement_fallback( $url ) {
	/**
	 * Filters the Mediaelement fallback output for no-JS.
	 *
	 * @since 3.6.0
	 *
	 * @param string $output Fallback output for no-JS.
	 * @param string $url    Media file URL.
	 */
	return apply_filters( 'wp_mediaelement_fallback', sprintf( '<a href="%1$s">%1$s</a>', esc_url( $url ) ), $url );
}

/**
 * Returns a filtered list of supported audio formats.
 *
 * @since 3.6.0
 *
 * @return string[] Supported audio formats.
 */
function wp_get_audio_extensions() {
	/**
	 * Filters the list of supported audio formats.
	 *
	 * @since 3.6.0
	 *
	 * @param string[] $extensions An array of supported audio formats. Defaults are
	 *                            'mp3', 'ogg', 'flac', 'm4a', 'wav'.
	 */
	return apply_filters( 'wp_audio_extensions', array( 'mp3', 'ogg', 'flac', 'm4a', 'wav' ) );
}

/**
 * Returns useful keys to use to lookup data from an attachment's stored metadata.
 *
 * @since 3.9.0
 *
 * @param WP_Post $attachment The current attachment, provided for context.
 * @param string  $context    Optional. The context. Accepts 'edit', 'display'. Default 'display'.
 * @return string[] Key/value pairs of field keys to labels.
 */
function wp_get_attachment_id3_keys( $attachment, $context = 'display' ) {
	$fields = array(
		'artist' => __( 'Artist' ),
		'album'  => __( 'Album' ),
	);

	if ( 'display' === $context ) {
		$fields['genre']            = __( 'Genre' );
		$fields['year']             = __( 'Year' );
		$fields['length_formatted'] = _x( 'Length', 'video or audio' );
	} elseif ( 'js' === $context ) {
		$fields['bitrate']      = __( 'Bitrate' );
		$fields['bitrate_mode'] = __( 'Bitrate Mode' );
	}

	/**
	 * Filters the editable list of keys to look up data from an attachment's metadata.
	 *
	 * @since 3.9.0
	 *
	 * @param array   $fields     Key/value pairs of field keys to labels.
	 * @param WP_Post $attachment Attachment object.
	 * @param string  $context    The context. Accepts 'edit', 'display'. Default 'display'.
	 */
	return apply_filters( 'wp_get_attachment_id3_keys', $fields, $attachment, $context );
}
/**
 * Builds the Audio shortcode output.
 *
 * This implements the functionality of the Audio Shortcode for displaying
 * WordPress mp3s in a post.
 *
 * @since 3.6.0
 *
 * @param array  $attr {
 *     Attributes of the audio shortcode.
 *
 *     @type string $src      URL to the source of the audio file. Default empty.
 *     @type string $loop     The 'loop' attribute for the `<audio>` element. Default empty.
 *     @type string $autoplay The 'autoplay' attribute for the `<audio>` element. Default empty.
 *     @type string $preload  The 'preload' attribute for the `<audio>` element. Default 'none'.
 *     @type string $class    The 'class' attribute for the `<audio>` element. Default 'wp-audio-shortcode'.
 *     @type string $style    The 'style' attribute for the `<audio>` element. Default 'width: 100%;'.
 * }
 * @param string $content Shortcode content.
 * @return string|void HTML content to display audio.
 */
function wp_audio_shortcode( $attr, $content = '' ) {
	$post_id = get_post() ? get_the_ID() : 0;

	static $instance = 0;
	$instance++;

	/**
	 * Filters the default audio shortcode output.
	 *
	 * If the filtered output isn't empty, it will be used instead of generating the default audio template.
	 *
	 * @since 3.6.0
	 *
	 * @param string $html     Empty variable to be replaced with shortcode markup.
	 * @param array  $attr     Attributes of the shortcode. @see wp_audio_shortcode()
	 * @param string $content  Shortcode content.
	 * @param int    $instance Unique numeric ID of this audio shortcode instance.
	 */
	$override = apply_filters( 'wp_audio_shortcode_override', '', $attr, $content, $instance );

	if ( '' !== $override ) {
		return $override;
	}

	$audio = null;

	$default_types = wp_get_audio_extensions();
	$defaults_atts = array(
		'src'      => '',
		'loop'     => '',
		'autoplay' => '',
		'preload'  => 'none',
		'class'    => 'wp-audio-shortcode',
		'style'    => 'width: 100%;',
	);
	foreach ( $default_types as $type ) {
		$defaults_atts[ $type ] = '';
	}

	$atts = shortcode_atts( $defaults_atts, $attr, 'audio' );

	$primary = false;
	if ( ! empty( $atts['src'] ) ) {
		$type = wp_check_filetype( $atts['src'], wp_get_mime_types() );

		if ( ! in_array( strtolower( $type['ext'] ), $default_types, true ) ) {
			return sprintf( '<a class="wp-embedded-audio" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
		}

		$primary = true;
		array_unshift( $default_types, 'src' );
	} else {
		foreach ( $default_types as $ext ) {
			if ( ! empty( $atts[ $ext ] ) ) {
				$type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );

				if ( strtolower( $type['ext'] ) === $ext ) {
					$primary = true;
				}
			}
		}
	}

	if ( ! $primary ) {
		$audios = get_attached_media( 'audio', $post_id );

		if ( empty( $audios ) ) {
			return;
		}

		$audio       = reset( $audios );
		$atts['src'] = wp_get_attachment_url( $audio->ID );

		if ( empty( $atts['src'] ) ) {
			return;
		}

		array_unshift( $default_types, 'src' );
	}

	/**
	 * Filters the media library used for the audio shortcode.
	 *
	 * @since 3.6.0
	 *
	 * @param string $library Media library used for the audio shortcode.
	 */
	$library = apply_filters( 'wp_audio_shortcode_library', 'mediaelement' );

	if ( 'mediaelement' === $library && did_action( 'init' ) ) {
		wp_enqueue_style( 'wp-mediaelement' );
		wp_enqueue_script( 'wp-mediaelement' );
	}

	/**
	 * Filters the class attribute for the audio shortcode output container.
	 *
	 * @since 3.6.0
	 * @since 4.9.0 The `$atts` parameter was added.
	 *
	 * @param string $class CSS class or list of space-separated classes.
	 * @param array  $atts  Array of audio shortcode attributes.
	 */
	$atts['class'] = apply_filters( 'wp_audio_shortcode_class', $atts['class'], $atts );

	$html_atts = array(
		'class'    => $atts['class'],
		'id'       => sprintf( 'audio-%d-%d', $post_id, $instance ),
		'loop'     => wp_validate_boolean( $atts['loop'] ),
		'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
		'preload'  => $atts['preload'],
		'style'    => $atts['style'],
	);

	// These ones should just be omitted altogether if they are blank.
	foreach ( array( 'loop', 'autoplay', 'preload' ) as $a ) {
		if ( empty( $html_atts[ $a ] ) ) {
			unset( $html_atts[ $a ] );
		}
	}

	$attr_strings = array();

	foreach ( $html_atts as $k => $v ) {
		$attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
	}

	$html = '';

	if ( 'mediaelement' === $library && 1 === $instance ) {
		$html .= "<!--[if lt IE 9]><script>document.createElement('audio');</script><![endif]-->\n";
	}

	$html .= sprintf( '<audio %s controls="controls">', implode( ' ', $attr_strings ) );

	$fileurl = '';
	$source  = '<source type="%s" src="%s" />';

	foreach ( $default_types as $fallback ) {
		if ( ! empty( $atts[ $fallback ] ) ) {
			if ( empty( $fileurl ) ) {
				$fileurl = $atts[ $fallback ];
			}

			$type  = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
			$url   = add_query_arg( '_', $instance, $atts[ $fallback ] );
			$html .= sprintf( $source, $type['type'], esc_url( $url ) );
		}
	}

	if ( 'mediaelement' === $library ) {
		$html .= wp_mediaelement_fallback( $fileurl );
	}

	$html .= '</audio>';

	/**
	 * Filters the audio shortcode output.
	 *
	 * @since 3.6.0
	 *
	 * @param string $html    Audio shortcode HTML output.
	 * @param array  $atts    Array of audio shortcode attributes.
	 * @param string $audio   Audio file.
	 * @param int    $post_id Post ID.
	 * @param string $library Media library used for the audio shortcode.
	 */
	return apply_filters( 'wp_audio_shortcode', $html, $atts, $audio, $post_id, $library );
}
add_shortcode( 'audio', 'wp_audio_shortcode' );

/**
 * Returns a filtered list of supported video formats.
 *
 * @since 3.6.0
 *
 * @return string[] List of supported video formats.
 */
function wp_get_video_extensions() {
	/**
	 * Filters the list of supported video formats.
	 *
	 * @since 3.6.0
	 *
	 * @param string[] $extensions An array of supported video formats. Defaults are
	 *                             'mp4', 'm4v', 'webm', 'ogv', 'flv'.
	 */
	return apply_filters( 'wp_video_extensions', array( 'mp4', 'm4v', 'webm', 'ogv', 'flv' ) );
}

/**
 * Builds the Video shortcode output.
 *
 * This implements the functionality of the Video Shortcode for displaying
 * WordPress mp4s in a post.
 *
 * @since 3.6.0
 *
 * @global int $content_width
 *
 * @param array  $attr {
 *     Attributes of the shortcode.
 *
 *     @type string $src      URL to the source of the video file. Default empty.
 *     @type int    $height   Height of the video embed in pixels. Default 360.
 *     @type int    $width    Width of the video embed in pixels. Default $content_width or 640.
 *     @type string $poster   The 'poster' attribute for the `<video>` element. Default empty.
 *     @type string $loop     The 'loop' attribute for the `<video>` element. Default empty.
 *     @type string $autoplay The 'autoplay' attribute for the `<video>` element. Default empty.
 *     @type string $preload  The 'preload' attribute for the `<video>` element.
 *                            Default 'metadata'.
 *     @type string $class    The 'class' attribute for the `<video>` element.
 *                            Default 'wp-video-shortcode'.
 * }
 * @param string $content Shortcode content.
 * @return string|void HTML content to display video.
 */
function wp_video_shortcode( $attr, $content = '' ) {
	global $content_width;
	$post_id = get_post() ? get_the_ID() : 0;

	static $instance = 0;
	$instance++;

	/**
	 * Filters the default video shortcode output.
	 *
	 * If the filtered output isn't empty, it will be used instead of generating
	 * the default video template.
	 *
	 * @since 3.6.0
	 *
	 * @see wp_video_shortcode()
	 *
	 * @param string $html     Empty variable to be replaced with shortcode markup.
	 * @param array  $attr     Attributes of the shortcode. @see wp_video_shortcode()
	 * @param string $content  Video shortcode content.
	 * @param int    $instance Unique numeric ID of this video shortcode instance.
	 */
	$override = apply_filters( 'wp_video_shortcode_override', '', $attr, $content, $instance );

	if ( '' !== $override ) {
		return $override;
	}

	$video = null;

	$default_types = wp_get_video_extensions();
	$defaults_atts = array(
		'src'      => '',
		'poster'   => '',
		'loop'     => '',
		'autoplay' => '',
		'preload'  => 'metadata',
		'width'    => 640,
		'height'   => 360,
		'class'    => 'wp-video-shortcode',
	);

	foreach ( $default_types as $type ) {
		$defaults_atts[ $type ] = '';
	}

	$atts = shortcode_atts( $defaults_atts, $attr, 'video' );

	if ( is_admin() ) {
		// Shrink the video so it isn't huge in the admin.
		if ( $atts['width'] > $defaults_atts['width'] ) {
			$atts['height'] = round( ( $atts['height'] * $defaults_atts['width'] ) / $atts['width'] );
			$atts['width']  = $defaults_atts['width'];
		}
	} else {
		// If the video is bigger than the theme.
		if ( ! empty( $content_width ) && $atts['width'] > $content_width ) {
			$atts['height'] = round( ( $atts['height'] * $content_width ) / $atts['width'] );
			$atts['width']  = $content_width;
		}
	}

	$is_vimeo      = false;
	$is_youtube    = false;
	$yt_pattern    = '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#';
	$vimeo_pattern = '#^https?://(.+\.)?vimeo\.com/.*#';

	$primary = false;
	if ( ! empty( $atts['src'] ) ) {
		$is_vimeo   = ( preg_match( $vimeo_pattern, $atts['src'] ) );
		$is_youtube = ( preg_match( $yt_pattern, $atts['src'] ) );

		if ( ! $is_youtube && ! $is_vimeo ) {
			$type = wp_check_filetype( $atts['src'], wp_get_mime_types() );

			if ( ! in_array( strtolower( $type['ext'] ), $default_types, true ) ) {
				return sprintf( '<a class="wp-embedded-video" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
			}
		}

		if ( $is_vimeo ) {
			wp_enqueue_script( 'mediaelement-vimeo' );
		}

		$primary = true;
		array_unshift( $default_types, 'src' );
	} else {
		foreach ( $default_types as $ext ) {
			if ( ! empty( $atts[ $ext ] ) ) {
				$type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
				if ( strtolower( $type['ext'] ) === $ext ) {
					$primary = true;
				}
			}
		}
	}

	if ( ! $primary ) {
		$videos = get_attached_media( 'video', $post_id );
		if ( empty( $videos ) ) {
			return;
		}

		$video       = reset( $videos );
		$atts['src'] = wp_get_attachment_url( $video->ID );
		if ( empty( $atts['src'] ) ) {
			return;
		}

		array_unshift( $default_types, 'src' );
	}

	/**
	 * Filters the media library used for the video shortcode.
	 *
	 * @since 3.6.0
	 *
	 * @param string $library Media library used for the video shortcode.
	 */
	$library = apply_filters( 'wp_video_shortcode_library', 'mediaelement' );
	if ( 'mediaelement' === $library && did_action( 'init' ) ) {
		wp_enqueue_style( 'wp-mediaelement' );
		wp_enqueue_script( 'wp-mediaelement' );
		wp_enqueue_script( 'mediaelement-vimeo' );
	}

	// MediaElement.js has issues with some URL formats for Vimeo and YouTube,
	// so update the URL to prevent the ME.js player from breaking.
	if ( 'mediaelement' === $library ) {
		if ( $is_youtube ) {
			// Remove `feature` query arg and force SSL - see #40866.
			$atts['src'] = remove_query_arg( 'feature', $atts['src'] );
			$atts['src'] = set_url_scheme( $atts['src'], 'https' );
		} elseif ( $is_vimeo ) {
			// Remove all query arguments and force SSL - see #40866.
			$parsed_vimeo_url = wp_parse_url( $atts['src'] );
			$vimeo_src        = 'https://' . $parsed_vimeo_url['host'] . $parsed_vimeo_url['path'];

			// Add loop param for mejs bug - see #40977, not needed after #39686.
			$loop        = $atts['loop'] ? '1' : '0';
			$atts['src'] = add_query_arg( 'loop', $loop, $vimeo_src );
		}
	}

	/**
	 * Filters the class attribute for the video shortcode output container.
	 *
	 * @since 3.6.0
	 * @since 4.9.0 The `$atts` parameter was added.
	 *
	 * @param string $class CSS class or list of space-separated classes.
	 * @param array  $atts  Array of video shortcode attributes.
	 */
	$atts['class'] = apply_filters( 'wp_video_shortcode_class', $atts['class'], $atts );

	$html_atts = array(
		'class'    => $atts['class'],
		'id'       => sprintf( 'video-%d-%d', $post_id, $instance ),
		'width'    => absint( $atts['width'] ),
		'height'   => absint( $atts['height'] ),
		'poster'   => esc_url( $atts['poster'] ),
		'loop'     => wp_validate_boolean( $atts['loop'] ),
		'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
		'preload'  => $atts['preload'],
	);

	// These ones should just be omitted altogether if they are blank.
	foreach ( array( 'poster', 'loop', 'autoplay', 'preload' ) as $a ) {
		if ( empty( $html_atts[ $a ] ) ) {
			unset( $html_atts[ $a ] );
		}
	}

	$attr_strings = array();
	foreach ( $html_atts as $k => $v ) {
		$attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
	}

	$html = '';

	if ( 'mediaelement' === $library && 1 === $instance ) {
		$html .= "<!--[if lt IE 9]><script>document.createElement('video');</script><![endif]-->\n";
	}

	$html .= sprintf( '<video %s controls="controls">', implode( ' ', $attr_strings ) );

	$fileurl = '';
	$source  = '<source type="%s" src="%s" />';

	foreach ( $default_types as $fallback ) {
		if ( ! empty( $atts[ $fallback ] ) ) {
			if ( empty( $fileurl ) ) {
				$fileurl = $atts[ $fallback ];
			}
			if ( 'src' === $fallback && $is_youtube ) {
				$type = array( 'type' => 'video/youtube' );
			} elseif ( 'src' === $fallback && $is_vimeo ) {
				$type = array( 'type' => 'video/vimeo' );
			} else {
				$type = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
			}
			$url   = add_query_arg( '_', $instance, $atts[ $fallback ] );
			$html .= sprintf( $source, $type['type'], esc_url( $url ) );
		}
	}

	if ( ! empty( $content ) ) {
		if ( false !== strpos( $content, "\n" ) ) {
			$content = str_replace( array( "\r\n", "\n", "\t" ), '', $content );
		}
		$html .= trim( $content );
	}

	if ( 'mediaelement' === $library ) {
		$html .= wp_mediaelement_fallback( $fileurl );
	}
	$html .= '</video>';

	$width_rule = '';
	if ( ! empty( $atts['width'] ) ) {
		$width_rule = sprintf( 'width: %dpx;', $atts['width'] );
	}
	$output = sprintf( '<div style="%s" class="wp-video">%s</div>', $width_rule, $html );

	/**
	 * Filters the output of the video shortcode.
	 *
	 * @since 3.6.0
	 *
	 * @param string $output  Video shortcode HTML output.
	 * @param array  $atts    Array of video shortcode attributes.
	 * @param string $video   Video file.
	 * @param int    $post_id Post ID.
	 * @param string $library Media library used for the video shortcode.
	 */
	return apply_filters( 'wp_video_shortcode', $output, $atts, $video, $post_id, $library );
}
add_shortcode( 'video', 'wp_video_shortcode' );

/**
 * Gets the previous image link that has the same post parent.
 *
 * @since 5.8.0
 *
 * @see get_adjacent_image_link()
 *
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param string|false $text Optional. Link text. Default false.
 * @return string Markup for previous image link.
 */
function get_previous_image_link( $size = 'thumbnail', $text = false ) {
	return get_adjacent_image_link( true, $size, $text );
}

/**
 * Displays previous image link that has the same post parent.
 *
 * @since 2.5.0
 *
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param string|false $text Optional. Link text. Default false.
 */
function previous_image_link( $size = 'thumbnail', $text = false ) {
	echo get_previous_image_link( $size, $text );
}

/**
 * Gets the next image link that has the same post parent.
 *
 * @since 5.8.0
 *
 * @see get_adjacent_image_link()
 *
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param string|false $text Optional. Link text. Default false.
 * @return string Markup for next image link.
 */
function get_next_image_link( $size = 'thumbnail', $text = false ) {
	return get_adjacent_image_link( false, $size, $text );
}

/**
 * Displays next image link that has the same post parent.
 *
 * @since 2.5.0
 *
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param string|false $text Optional. Link text. Default false.
 */
function next_image_link( $size = 'thumbnail', $text = false ) {
	echo get_next_image_link( $size, $text );
}

/**
 * Gets the next or previous image link that has the same post parent.
 *
 * Retrieves the current attachment object from the $post global.
 *
 * @since 5.8.0
 *
 * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $text Optional. Link text. Default false.
 * @return string Markup for image link.
 */
function get_adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
	$post        = get_post();
	$attachments = array_values(
		get_children(
			array(
				'post_parent'    => $post->post_parent,
				'post_status'    => 'inherit',
				'post_type'      => 'attachment',
				'post_mime_type' => 'image',
				'order'          => 'ASC',
				'orderby'        => 'menu_order ID',
			)
		)
	);

	foreach ( $attachments as $k => $attachment ) {
		if ( (int) $attachment->ID === (int) $post->ID ) {
			break;
		}
	}

	$output        = '';
	$attachment_id = 0;

	if ( $attachments ) {
		$k = $prev ? $k - 1 : $k + 1;

		if ( isset( $attachments[ $k ] ) ) {
			$attachment_id = $attachments[ $k ]->ID;
			$attr          = array( 'alt' => get_the_title( $attachment_id ) );
			$output        = wp_get_attachment_link( $attachment_id, $size, true, false, $text, $attr );
		}
	}

	$adjacent = $prev ? 'previous' : 'next';

	/**
	 * Filters the adjacent image link.
	 *
	 * The dynamic portion of the hook name, `$adjacent`, refers to the type of adjacency,
	 * either 'next', or 'previous'.
	 *
	 * Possible hook names include:
	 *
	 *  - `next_image_link`
	 *  - `previous_image_link`
	 *
	 * @since 3.5.0
	 *
	 * @param string $output        Adjacent image HTML markup.
	 * @param int    $attachment_id Attachment ID
	 * @param string|int[] $size    Requested image size. Can be any registered image size name, or
	 *                              an array of width and height values in pixels (in that order).
	 * @param string $text          Link text.
	 */
	return apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text );
}

/**
 * Displays next or previous image link that has the same post parent.
 *
 * Retrieves the current attachment object from the $post global.
 *
 * @since 2.5.0
 *
 * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $text Optional. Link text. Default false.
 */
function adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
	echo get_adjacent_image_link( $prev, $size, $text );
}

/**
 * Retrieves taxonomies attached to given the attachment.
 *
 * @since 2.5.0
 * @since 4.7.0 Introduced the `$output` parameter.
 *
 * @param int|array|object $attachment Attachment ID, data array, or data object.
 * @param string           $output     Output type. 'names' to return an array of taxonomy names,
 *                                     or 'objects' to return an array of taxonomy objects.
 *                                     Default is 'names'.
 * @return string[]|WP_Taxonomy[] List of taxonomies or taxonomy names. Empty array on failure.
 */
function get_attachment_taxonomies( $attachment, $output = 'names' ) {
	if ( is_int( $attachment ) ) {
		$attachment = get_post( $attachment );
	} elseif ( is_array( $attachment ) ) {
		$attachment = (object) $attachment;
	}

	if ( ! is_object( $attachment ) ) {
		return array();
	}

	$file     = get_attached_file( $attachment->ID );
	$filename = wp_basename( $file );

	$objects = array( 'attachment' );

	if ( false !== strpos( $filename, '.' ) ) {
		$objects[] = 'attachment:' . substr( $filename, strrpos( $filename, '.' ) + 1 );
	}

	if ( ! empty( $attachment->post_mime_type ) ) {
		$objects[] = 'attachment:' . $attachment->post_mime_type;

		if ( false !== strpos( $attachment->post_mime_type, '/' ) ) {
			foreach ( explode( '/', $attachment->post_mime_type ) as $token ) {
				if ( ! empty( $token ) ) {
					$objects[] = "attachment:$token";
				}
			}
		}
	}

	$taxonomies = array();

	foreach ( $objects as $object ) {
		$taxes = get_object_taxonomies( $object, $output );

		if ( $taxes ) {
			$taxonomies = array_merge( $taxonomies, $taxes );
		}
	}

	if ( 'names' === $output ) {
		$taxonomies = array_unique( $taxonomies );
	}

	return $taxonomies;
}

/**
 * Retrieves all of the taxonomies that are registered for attachments.
 *
 * Handles mime-type-specific taxonomies such as attachment:image and attachment:video.
 *
 * @since 3.5.0
 *
 * @see get_taxonomies()
 *
 * @param string $output Optional. The type of taxonomy output to return. Accepts 'names' or 'objects'.
 *                       Default 'names'.
 * @return string[]|WP_Taxonomy[] Array of names or objects of registered taxonomies for attachments.
 */
function get_taxonomies_for_attachments( $output = 'names' ) {
	$taxonomies = array();

	foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy ) {
		foreach ( $taxonomy->object_type as $object_type ) {
			if ( 'attachment' === $object_type || 0 === strpos( $object_type, 'attachment:' ) ) {
				if ( 'names' === $output ) {
					$taxonomies[] = $taxonomy->name;
				} else {
					$taxonomies[ $taxonomy->name ] = $taxonomy;
				}
				break;
			}
		}
	}

	return $taxonomies;
}

/**
 * Determines whether the value is an acceptable type for GD image functions.
 *
 * In PHP 8.0, the GD extension uses GdImage objects for its data structures.
 * This function checks if the passed value is either a resource of type `gd`
 * or a GdImage object instance. Any other type will return false.
 *
 * @since 5.6.0
 *
 * @param resource|GdImage|false $image A value to check the type for.
 * @return bool True if $image is either a GD image resource or GdImage instance,
 *              false otherwise.
 */
function is_gd_image( $image ) {
	if ( is_resource( $image ) && 'gd' === get_resource_type( $image )
		|| is_object( $image ) && $image instanceof GdImage
	) {
		return true;
	}

	return false;
}

/**
 * Create new GD image resource with transparency support
 *
 * @todo Deprecate if possible.
 *
 * @since 2.9.0
 *
 * @param int $width  Image width in pixels.
 * @param int $height Image height in pixels.
 * @return resource|GdImage|false The GD image resource or GdImage instance on success.
 *                                False on failure.
 */
function wp_imagecreatetruecolor( $width, $height ) {
	$img = imagecreatetruecolor( $width, $height );

	if ( is_gd_image( $img )
		&& function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' )
	) {
		imagealphablending( $img, false );
		imagesavealpha( $img, true );
	}

	return $img;
}

/**
 * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height.
 *
 * @since 2.9.0
 *
 * @see wp_constrain_dimensions()
 *
 * @param int $example_width  The width of an example embed.
 * @param int $example_height The height of an example embed.
 * @param int $max_width      The maximum allowed width.
 * @param int $max_height     The maximum allowed height.
 * @return int[] {
 *     An array of maximum width and height values.
 *
 *     @type int $0 The maximum width in pixels.
 *     @type int $1 The maximum height in pixels.
 * }
 */
function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) {
	$example_width  = (int) $example_width;
	$example_height = (int) $example_height;
	$max_width      = (int) $max_width;
	$max_height     = (int) $max_height;

	return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height );
}

/**
 * Determines the maximum upload size allowed in php.ini.
 *
 * @since 2.5.0
 *
 * @return int Allowed upload size.
 */
function wp_max_upload_size() {
	$u_bytes = wp_convert_hr_to_bytes( ini_get( 'upload_max_filesize' ) );
	$p_bytes = wp_convert_hr_to_bytes( ini_get( 'post_max_size' ) );

	/**
	 * Filters the maximum upload size allowed in php.ini.
	 *
	 * @since 2.5.0
	 *
	 * @param int $size    Max upload size limit in bytes.
	 * @param int $u_bytes Maximum upload filesize in bytes.
	 * @param int $p_bytes Maximum size of POST data in bytes.
	 */
	return apply_filters( 'upload_size_limit', min( $u_bytes, $p_bytes ), $u_bytes, $p_bytes );
}

/**
 * Returns a WP_Image_Editor instance and loads file into it.
 *
 * @since 3.5.0
 *
 * @param string $path Path to the file to load.
 * @param array  $args Optional. Additional arguments for retrieving the image editor.
 *                     Default empty array.
 * @return WP_Image_Editor|WP_Error The WP_Image_Editor object on success,
 *                                  a WP_Error object otherwise.
 */
function wp_get_image_editor( $path, $args = array() ) {
	$args['path'] = $path;

	if ( ! isset( $args['mime_type'] ) ) {
		$file_info = wp_check_filetype( $args['path'] );

		// If $file_info['type'] is false, then we let the editor attempt to
		// figure out the file type, rather than forcing a failure based on extension.
		if ( isset( $file_info ) && $file_info['type'] ) {
			$args['mime_type'] = $file_info['type'];
		}
	}

	$implementation = _wp_image_editor_choose( $args );

	if ( $implementation ) {
		$editor = new $implementation( $path );
		$loaded = $editor->load();

		if ( is_wp_error( $loaded ) ) {
			return $loaded;
		}

		return $editor;
	}

	return new WP_Error( 'image_no_editor', __( 'No editor could be selected.' ) );
}

/**
 * Tests whether there is an editor that supports a given mime type or methods.
 *
 * @since 3.5.0
 *
 * @param string|array $args Optional. Array of arguments to retrieve the image editor supports.
 *                           Default empty array.
 * @return bool True if an eligible editor is found; false otherwise.
 */
function wp_image_editor_supports( $args = array() ) {
	return (bool) _wp_image_editor_choose( $args );
}

/**
 * Tests which editors are capable of supporting the request.
 *
 * @ignore
 * @since 3.5.0
 *
 * @param array $args Optional. Array of arguments for choosing a capable editor. Default empty array.
 * @return string|false Class name for the first editor that claims to support the request.
 *                      False if no editor claims to support the request.
 */
function _wp_image_editor_choose( $args = array() ) {
	require_once ABSPATH . WPINC . '/class-wp-image-editor.php';
	require_once ABSPATH . WPINC . '/class-wp-image-editor-gd.php';
	require_once ABSPATH . WPINC . '/class-wp-image-editor-imagick.php';
	/**
	 * Filters the list of image editing library classes.
	 *
	 * @since 3.5.0
	 *
	 * @param string[] $image_editors Array of available image editor class names. Defaults are
	 *                                'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'.
	 */
	$implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) );

	foreach ( $implementations as $implementation ) {
		if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) {
			continue;
		}

		if ( isset( $args['mime_type'] ) &&
			! call_user_func(
				array( $implementation, 'supports_mime_type' ),
				$args['mime_type']
			) ) {
			continue;
		}

		if ( isset( $args['methods'] ) &&
			array_diff( $args['methods'], get_class_methods( $implementation ) ) ) {

			continue;
		}

		return $implementation;
	}

	return false;
}

/**
 * Prints default Plupload arguments.
 *
 * @since 3.4.0
 */
function wp_plupload_default_settings() {
	$wp_scripts = wp_scripts();

	$data = $wp_scripts->get_data( 'wp-plupload', 'data' );
	if ( $data && false !== strpos( $data, '_wpPluploadSettings' ) ) {
		return;
	}

	$max_upload_size    = wp_max_upload_size();
	$allowed_extensions = array_keys( get_allowed_mime_types() );
	$extensions         = array();
	foreach ( $allowed_extensions as $extension ) {
		$extensions = array_merge( $extensions, explode( '|', $extension ) );
	}

	/*
	 * Since 4.9 the `runtimes` setting is hardcoded in our version of Plupload to `html5,html4`,
	 * and the `flash_swf_url` and `silverlight_xap_url` are not used.
	 */
	$defaults = array(
		'file_data_name' => 'async-upload', // Key passed to $_FILE.
		'url'            => admin_url( 'async-upload.php', 'relative' ),
		'filters'        => array(
			'max_file_size' => $max_upload_size . 'b',
			'mime_types'    => array( array( 'extensions' => implode( ',', $extensions ) ) ),
		),
	);

	/*
	 * Currently only iOS Safari supports multiple files uploading,
	 * but iOS 7.x has a bug that prevents uploading of videos when enabled.
	 * See #29602.
	 */
	if ( wp_is_mobile() && strpos( $_SERVER['HTTP_USER_AGENT'], 'OS 7_' ) !== false &&
		strpos( $_SERVER['HTTP_USER_AGENT'], 'like Mac OS X' ) !== false ) {

		$defaults['multi_selection'] = false;
	}

	// Check if WebP images can be edited.
	if ( ! wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
		$defaults['webp_upload_error'] = true;
	}

	/**
	 * Filters the Plupload default settings.
	 *
	 * @since 3.4.0
	 *
	 * @param array $defaults Default Plupload settings array.
	 */
	$defaults = apply_filters( 'plupload_default_settings', $defaults );

	$params = array(
		'action' => 'upload-attachment',
	);

	/**
	 * Filters the Plupload default parameters.
	 *
	 * @since 3.4.0
	 *
	 * @param array $params Default Plupload parameters array.
	 */
	$params = apply_filters( 'plupload_default_params', $params );

	$params['_wpnonce'] = wp_create_nonce( 'media-form' );

	$defaults['multipart_params'] = $params;

	$settings = array(
		'defaults'      => $defaults,
		'browser'       => array(
			'mobile'    => wp_is_mobile(),
			'supported' => _device_can_upload(),
		),
		'limitExceeded' => is_multisite() && ! is_upload_space_available(),
	);

	$script = 'var _wpPluploadSettings = ' . wp_json_encode( $settings ) . ';';

	if ( $data ) {
		$script = "$data\n$script";
	}

	$wp_scripts->add_data( 'wp-plupload', 'data', $script );
}

/**
 * Prepares an attachment post object for JS, where it is expected
 * to be JSON-encoded and fit into an Attachment model.
 *
 * @since 3.5.0
 *
 * @param int|WP_Post $attachment Attachment ID or object.
 * @return array|void {
 *     Array of attachment details, or void if the parameter does not correspond to an attachment.
 *
 *     @type string $alt                   Alt text of the attachment.
 *     @type string $author                ID of the attachment author, as a string.
 *     @type string $authorName            Name of the attachment author.
 *     @type string $caption               Caption for the attachment.
 *     @type array  $compat                Containing item and meta.
 *     @type string $context               Context, whether it's used as the site icon for example.
 *     @type int    $date                  Uploaded date, timestamp in milliseconds.
 *     @type string $dateFormatted         Formatted date (e.g. June 29, 2018).
 *     @type string $description           Description of the attachment.
 *     @type string $editLink              URL to the edit page for the attachment.
 *     @type string $filename              File name of the attachment.
 *     @type string $filesizeHumanReadable Filesize of the attachment in human readable format (e.g. 1 MB).
 *     @type int    $filesizeInBytes       Filesize of the attachment in bytes.
 *     @type int    $height                If the attachment is an image, represents the height of the image in pixels.
 *     @type string $icon                  Icon URL of the attachment (e.g. /wp-includes/images/media/archive.png).
 *     @type int    $id                    ID of the attachment.
 *     @type string $link                  URL to the attachment.
 *     @type int    $menuOrder             Menu order of the attachment post.
 *     @type array  $meta                  Meta data for the attachment.
 *     @type string $mime                  Mime type of the attachment (e.g. image/jpeg or application/zip).
 *     @type int    $modified              Last modified, timestamp in milliseconds.
 *     @type string $name                  Name, same as title of the attachment.
 *     @type array  $nonces                Nonces for update, delete and edit.
 *     @type string $orientation           If the attachment is an image, represents the image orientation
 *                                         (landscape or portrait).
 *     @type array  $sizes                 If the attachment is an image, contains an array of arrays
 *                                         for the images sizes: thumbnail, medium, large, and full.
 *     @type string $status                Post status of the attachment (usually 'inherit').
 *     @type string $subtype               Mime subtype of the attachment (usually the last part, e.g. jpeg or zip).
 *     @type string $title                 Title of the attachment (usually slugified file name without the extension).
 *     @type string $type                  Type of the attachment (usually first part of the mime type, e.g. image).
 *     @type int    $uploadedTo            Parent post to which the attachment was uploaded.
 *     @type string $uploadedToLink        URL to the edit page of the parent post of the attachment.
 *     @type string $uploadedToTitle       Post title of the parent of the attachment.
 *     @type string $url                   Direct URL to the attachment file (from wp-content).
 *     @type int    $width                 If the attachment is an image, represents the width of the image in pixels.
 * }
 *
 */
function wp_prepare_attachment_for_js( $attachment ) {
	$attachment = get_post( $attachment );

	if ( ! $attachment ) {
		return;
	}

	if ( 'attachment' !== $attachment->post_type ) {
		return;
	}

	$meta = wp_get_attachment_metadata( $attachment->ID );
	if ( false !== strpos( $attachment->post_mime_type, '/' ) ) {
		list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
	} else {
		list( $type, $subtype ) = array( $attachment->post_mime_type, '' );
	}

	$attachment_url = wp_get_attachment_url( $attachment->ID );
	$base_url       = str_replace( wp_basename( $attachment_url ), '', $attachment_url );

	$response = array(
		'id'            => $attachment->ID,
		'title'         => $attachment->post_title,
		'filename'      => wp_basename( get_attached_file( $attachment->ID ) ),
		'url'           => $attachment_url,
		'link'          => get_attachment_link( $attachment->ID ),
		'alt'           => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
		'author'        => $attachment->post_author,
		'description'   => $attachment->post_content,
		'caption'       => $attachment->post_excerpt,
		'name'          => $attachment->post_name,
		'status'        => $attachment->post_status,
		'uploadedTo'    => $attachment->post_parent,
		'date'          => strtotime( $attachment->post_date_gmt ) * 1000,
		'modified'      => strtotime( $attachment->post_modified_gmt ) * 1000,
		'menuOrder'     => $attachment->menu_order,
		'mime'          => $attachment->post_mime_type,
		'type'          => $type,
		'subtype'       => $subtype,
		'icon'          => wp_mime_type_icon( $attachment->ID ),
		'dateFormatted' => mysql2date( __( 'F j, Y' ), $attachment->post_date ),
		'nonces'        => array(
			'update' => false,
			'delete' => false,
			'edit'   => false,
		),
		'editLink'      => false,
		'meta'          => false,
	);

	$author = new WP_User( $attachment->post_author );

	if ( $author->exists() ) {
		$author_name            = $author->display_name ? $author->display_name : $author->nickname;
		$response['authorName'] = html_entity_decode( $author_name, ENT_QUOTES, get_bloginfo( 'charset' ) );
		$response['authorLink'] = get_edit_user_link( $author->ID );
	} else {
		$response['authorName'] = __( '(no author)' );
	}

	if ( $attachment->post_parent ) {
		$post_parent = get_post( $attachment->post_parent );
		if ( $post_parent ) {
			$response['uploadedToTitle'] = $post_parent->post_title ? $post_parent->post_title : __( '(no title)' );
			$response['uploadedToLink']  = get_edit_post_link( $attachment->post_parent, 'raw' );
		}
	}

	$attached_file = get_attached_file( $attachment->ID );

	if ( isset( $meta['filesize'] ) ) {
		$bytes = $meta['filesize'];
	} elseif ( file_exists( $attached_file ) ) {
		$bytes = filesize( $attached_file );
	} else {
		$bytes = '';
	}

	if ( $bytes ) {
		$response['filesizeInBytes']       = $bytes;
		$response['filesizeHumanReadable'] = size_format( $bytes );
	}

	$context             = get_post_meta( $attachment->ID, '_wp_attachment_context', true );
	$response['context'] = ( $context ) ? $context : '';

	if ( current_user_can( 'edit_post', $attachment->ID ) ) {
		$response['nonces']['update'] = wp_create_nonce( 'update-post_' . $attachment->ID );
		$response['nonces']['edit']   = wp_create_nonce( 'image_editor-' . $attachment->ID );
		$response['editLink']         = get_edit_post_link( $attachment->ID, 'raw' );
	}

	if ( current_user_can( 'delete_post', $attachment->ID ) ) {
		$response['nonces']['delete'] = wp_create_nonce( 'delete-post_' . $attachment->ID );
	}

	if ( $meta && ( 'image' === $type || ! empty( $meta['sizes'] ) ) ) {
		$sizes = array();

		/** This filter is documented in wp-admin/includes/media.php */
		$possible_sizes = apply_filters(
			'image_size_names_choose',
			array(
				'thumbnail' => __( 'Thumbnail' ),
				'medium'    => __( 'Medium' ),
				'large'     => __( 'Large' ),
				'full'      => __( 'Full Size' ),
			)
		);
		unset( $possible_sizes['full'] );

		/*
		 * Loop through all potential sizes that may be chosen. Try to do this with some efficiency.
		 * First: run the image_downsize filter. If it returns something, we can use its data.
		 * If the filter does not return something, then image_downsize() is just an expensive way
		 * to check the image metadata, which we do second.
		 */
		foreach ( $possible_sizes as $size => $label ) {

			/** This filter is documented in wp-includes/media.php */
			$downsize = apply_filters( 'image_downsize', false, $attachment->ID, $size );

			if ( $downsize ) {
				if ( empty( $downsize[3] ) ) {
					continue;
				}

				$sizes[ $size ] = array(
					'height'      => $downsize[2],
					'width'       => $downsize[1],
					'url'         => $downsize[0],
					'orientation' => $downsize[2] > $downsize[1] ? 'portrait' : 'landscape',
				);
			} elseif ( isset( $meta['sizes'][ $size ] ) ) {
				// Nothing from the filter, so consult image metadata if we have it.
				$size_meta = $meta['sizes'][ $size ];

				// We have the actual image size, but might need to further constrain it if content_width is narrower.
				// Thumbnail, medium, and full sizes are also checked against the site's height/width options.
				list( $width, $height ) = image_constrain_size_for_editor( $size_meta['width'], $size_meta['height'], $size, 'edit' );

				$sizes[ $size ] = array(
					'height'      => $height,
					'width'       => $width,
					'url'         => $base_url . $size_meta['file'],
					'orientation' => $height > $width ? 'portrait' : 'landscape',
				);
			}
		}

		if ( 'image' === $type ) {
			if ( ! empty( $meta['original_image'] ) ) {
				$response['originalImageURL']  = wp_get_original_image_url( $attachment->ID );
				$response['originalImageName'] = wp_basename( wp_get_original_image_path( $attachment->ID ) );
			}

			$sizes['full'] = array( 'url' => $attachment_url );

			if ( isset( $meta['height'], $meta['width'] ) ) {
				$sizes['full']['height']      = $meta['height'];
				$sizes['full']['width']       = $meta['width'];
				$sizes['full']['orientation'] = $meta['height'] > $meta['width'] ? 'portrait' : 'landscape';
			}

			$response = array_merge( $response, $sizes['full'] );
		} elseif ( $meta['sizes']['full']['file'] ) {
			$sizes['full'] = array(
				'url'         => $base_url . $meta['sizes']['full']['file'],
				'height'      => $meta['sizes']['full']['height'],
				'width'       => $meta['sizes']['full']['width'],
				'orientation' => $meta['sizes']['full']['height'] > $meta['sizes']['full']['width'] ? 'portrait' : 'landscape',
			);
		}

		$response = array_merge( $response, array( 'sizes' => $sizes ) );
	}

	if ( $meta && 'video' === $type ) {
		if ( isset( $meta['width'] ) ) {
			$response['width'] = (int) $meta['width'];
		}
		if ( isset( $meta['height'] ) ) {
			$response['height'] = (int) $meta['height'];
		}
	}

	if ( $meta && ( 'audio' === $type || 'video' === $type ) ) {
		if ( isset( $meta['length_formatted'] ) ) {
			$response['fileLength']              = $meta['length_formatted'];
			$response['fileLengthHumanReadable'] = human_readable_duration( $meta['length_formatted'] );
		}

		$response['meta'] = array();
		foreach ( wp_get_attachment_id3_keys( $attachment, 'js' ) as $key => $label ) {
			$response['meta'][ $key ] = false;

			if ( ! empty( $meta[ $key ] ) ) {
				$response['meta'][ $key ] = $meta[ $key ];
			}
		}

		$id = get_post_thumbnail_id( $attachment->ID );
		if ( ! empty( $id ) ) {
			list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'full' );
			$response['image']            = compact( 'src', 'width', 'height' );
			list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'thumbnail' );
			$response['thumb']            = compact( 'src', 'width', 'height' );
		} else {
			$src               = wp_mime_type_icon( $attachment->ID );
			$width             = 48;
			$height            = 64;
			$response['image'] = compact( 'src', 'width', 'height' );
			$response['thumb'] = compact( 'src', 'width', 'height' );
		}
	}

	if ( function_exists( 'get_compat_media_markup' ) ) {
		$response['compat'] = get_compat_media_markup( $attachment->ID, array( 'in_modal' => true ) );
	}

	if ( function_exists( 'get_media_states' ) ) {
		$media_states = get_media_states( $attachment );
		if ( ! empty( $media_states ) ) {
			$response['mediaStates'] = implode( ', ', $media_states );
		}
	}

	/**
	 * Filters the attachment data prepared for JavaScript.
	 *
	 * @since 3.5.0
	 *
	 * @param array       $response   Array of prepared attachment data. @see wp_prepare_attachment_for_js().
	 * @param WP_Post     $attachment Attachment object.
	 * @param array|false $meta       Array of attachment meta data, or false if there is none.
	 */
	return apply_filters( 'wp_prepare_attachment_for_js', $response, $attachment, $meta );
}

/**
 * Enqueues all scripts, styles, settings, and templates necessary to use
 * all media JS APIs.
 *
 * @since 3.5.0
 *
 * @global int       $content_width
 * @global wpdb      $wpdb          WordPress database abstraction object.
 * @global WP_Locale $wp_locale     WordPress date and time locale object.
 *
 * @param array $args {
 *     Arguments for enqueuing media scripts.
 *
 *     @type int|WP_Post $post A post object or ID.
 * }
 */
function wp_enqueue_media( $args = array() ) {
	// Enqueue me just once per page, please.
	if ( did_action( 'wp_enqueue_media' ) ) {
		return;
	}

	global $content_width, $wpdb, $wp_locale;

	$defaults = array(
		'post' => null,
	);
	$args     = wp_parse_args( $args, $defaults );

	// We're going to pass the old thickbox media tabs to `media_upload_tabs`
	// to ensure plugins will work. We will then unset those tabs.
	$tabs = array(
		// handler action suffix => tab label
		'type'     => '',
		'type_url' => '',
		'gallery'  => '',
		'library'  => '',
	);

	/** This filter is documented in wp-admin/includes/media.php */
	$tabs = apply_filters( 'media_upload_tabs', $tabs );
	unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] );

	$props = array(
		'link'  => get_option( 'image_default_link_type' ), // DB default is 'file'.
		'align' => get_option( 'image_default_align' ),     // Empty default.
		'size'  => get_option( 'image_default_size' ),      // Empty default.
	);

	$exts      = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() );
	$mimes     = get_allowed_mime_types();
	$ext_mimes = array();
	foreach ( $exts as $ext ) {
		foreach ( $mimes as $ext_preg => $mime_match ) {
			if ( preg_match( '#' . $ext . '#i', $ext_preg ) ) {
				$ext_mimes[ $ext ] = $mime_match;
				break;
			}
		}
	}

	/**
	 * Allows showing or hiding the "Create Audio Playlist" button in the media library.
	 *
	 * By default, the "Create Audio Playlist" button will always be shown in
	 * the media library.  If this filter returns `null`, a query will be run
	 * to determine whether the media library contains any audio items.  This
	 * was the default behavior prior to version 4.8.0, but this query is
	 * expensive for large media libraries.
	 *
	 * @since 4.7.4
	 * @since 4.8.0 The filter's default value is `true` rather than `null`.
	 *
	 * @link https://core.trac.wordpress.org/ticket/31071
	 *
	 * @param bool|null $show Whether to show the button, or `null` to decide based
	 *                        on whether any audio files exist in the media library.
	 */
	$show_audio_playlist = apply_filters( 'media_library_show_audio_playlist', true );
	if ( null === $show_audio_playlist ) {
		$show_audio_playlist = $wpdb->get_var(
			"
			SELECT ID
			FROM $wpdb->posts
			WHERE post_type = 'attachment'
			AND post_mime_type LIKE 'audio%'
			LIMIT 1
		"
		);
	}

	/**
	 * Allows showing or hiding the "Create Video Playlist" button in the media library.
	 *
	 * By default, the "Create Video Playlist" button will always be shown in
	 * the media library.  If this filter returns `null`, a query will be run
	 * to determine whether the media library contains any video items.  This
	 * was the default behavior prior to version 4.8.0, but this query is
	 * expensive for large media libraries.
	 *
	 * @since 4.7.4
	 * @since 4.8.0 The filter's default value is `true` rather than `null`.
	 *
	 * @link https://core.trac.wordpress.org/ticket/31071
	 *
	 * @param bool|null $show Whether to show the button, or `null` to decide based
	 *                        on whether any video files exist in the media library.
	 */
	$show_video_playlist = apply_filters( 'media_library_show_video_playlist', true );
	if ( null === $show_video_playlist ) {
		$show_video_playlist = $wpdb->get_var(
			"
			SELECT ID
			FROM $wpdb->posts
			WHERE post_type = 'attachment'
			AND post_mime_type LIKE 'video%'
			LIMIT 1
		"
		);
	}

	/**
	 * Allows overriding the list of months displayed in the media library.
	 *
	 * By default (if this filter does not return an array), a query will be
	 * run to determine the months that have media items.  This query can be
	 * expensive for large media libraries, so it may be desirable for sites to
	 * override this behavior.
	 *
	 * @since 4.7.4
	 *
	 * @link https://core.trac.wordpress.org/ticket/31071
	 *
	 * @param array|null $months An array of objects with `month` and `year`
	 *                           properties, or `null` (or any other non-array value)
	 *                           for default behavior.
	 */
	$months = apply_filters( 'media_library_months_with_files', null );
	if ( ! is_array( $months ) ) {
		$months = $wpdb->get_results(
			$wpdb->prepare(
				"
			SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
			FROM $wpdb->posts
			WHERE post_type = %s
			ORDER BY post_date DESC
		",
				'attachment'
			)
		);
	}
	foreach ( $months as $month_year ) {
		$month_year->text = sprintf(
			/* translators: 1: Month, 2: Year. */
			__( '%1$s %2$d' ),
			$wp_locale->get_month( $month_year->month ),
			$month_year->year
		);
	}

	/**
	 * Filters whether the Media Library grid has infinite scrolling. Default `false`.
	 *
	 * @since 5.8.0
	 *
	 * @param bool $infinite Whether the Media Library grid has infinite scrolling.
	 */
	$infinite_scrolling = apply_filters( 'media_library_infinite_scrolling', false );

	$settings = array(
		'tabs'              => $tabs,
		'tabUrl'            => add_query_arg( array( 'chromeless' => true ), admin_url( 'media-upload.php' ) ),
		'mimeTypes'         => wp_list_pluck( get_post_mime_types(), 0 ),
		/** This filter is documented in wp-admin/includes/media.php */
		'captions'          => ! apply_filters( 'disable_captions', '' ),
		'nonce'             => array(
			'sendToEditor' => wp_create_nonce( 'media-send-to-editor' ),
		),
		'post'              => array(
			'id' => 0,
		),
		'defaultProps'      => $props,
		'attachmentCounts'  => array(
			'audio' => ( $show_audio_playlist ) ? 1 : 0,
			'video' => ( $show_video_playlist ) ? 1 : 0,
		),
		'oEmbedProxyUrl'    => rest_url( 'oembed/1.0/proxy' ),
		'embedExts'         => $exts,
		'embedMimes'        => $ext_mimes,
		'contentWidth'      => $content_width,
		'months'            => $months,
		'mediaTrash'        => MEDIA_TRASH ? 1 : 0,
		'infiniteScrolling' => ( $infinite_scrolling ) ? 1 : 0,
	);

	$post = null;
	if ( isset( $args['post'] ) ) {
		$post             = get_post( $args['post'] );
		$settings['post'] = array(
			'id'    => $post->ID,
			'nonce' => wp_create_nonce( 'update-post_' . $post->ID ),
		);

		$thumbnail_support = current_theme_supports( 'post-thumbnails', $post->post_type ) && post_type_supports( $post->post_type, 'thumbnail' );
		if ( ! $thumbnail_support && 'attachment' === $post->post_type && $post->post_mime_type ) {
			if ( wp_attachment_is( 'audio', $post ) ) {
				$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
			} elseif ( wp_attachment_is( 'video', $post ) ) {
				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
			}
		}

		if ( $thumbnail_support ) {
			$featured_image_id                   = get_post_meta( $post->ID, '_thumbnail_id', true );
			$settings['post']['featuredImageId'] = $featured_image_id ? $featured_image_id : -1;
		}
	}

	if ( $post ) {
		$post_type_object = get_post_type_object( $post->post_type );
	} else {
		$post_type_object = get_post_type_object( 'post' );
	}

	$strings = array(
		// Generic.
		'mediaFrameDefaultTitle'      => __( 'Media' ),
		'url'                         => __( 'URL' ),
		'addMedia'                    => __( 'Add media' ),
		'search'                      => __( 'Search' ),
		'select'                      => __( 'Select' ),
		'cancel'                      => __( 'Cancel' ),
		'update'                      => __( 'Update' ),
		'replace'                     => __( 'Replace' ),
		'remove'                      => __( 'Remove' ),
		'back'                        => __( 'Back' ),
		/*
		 * translators: This is a would-be plural string used in the media manager.
		 * If there is not a word you can use in your language to avoid issues with the
		 * lack of plural support here, turn it into "selected: %d" then translate it.
		 */
		'selected'                    => __( '%d selected' ),
		'dragInfo'                    => __( 'Drag and drop to reorder media files.' ),

		// Upload.
		'uploadFilesTitle'            => __( 'Upload files' ),
		'uploadImagesTitle'           => __( 'Upload images' ),

		// Library.
		'mediaLibraryTitle'           => __( 'Media Library' ),
		'insertMediaTitle'            => __( 'Add media' ),
		'createNewGallery'            => __( 'Create a new gallery' ),
		'createNewPlaylist'           => __( 'Create a new playlist' ),
		'createNewVideoPlaylist'      => __( 'Create a new video playlist' ),
		'returnToLibrary'             => __( '&#8592; Go to library' ),
		'allMediaItems'               => __( 'All media items' ),
		'allDates'                    => __( 'All dates' ),
		'noItemsFound'                => __( 'No items found.' ),
		'insertIntoPost'              => $post_type_object->labels->insert_into_item,
		'unattached'                  => _x( 'Unattached', 'media items' ),
		'mine'                        => _x( 'Mine', 'media items' ),
		'trash'                       => _x( 'Trash', 'noun' ),
		'uploadedToThisPost'          => $post_type_object->labels->uploaded_to_this_item,
		'warnDelete'                  => __( "You are about to permanently delete this item from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
		'warnBulkDelete'              => __( "You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
		'warnBulkTrash'               => __( "You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete." ),
		'bulkSelect'                  => __( 'Bulk select' ),
		'trashSelected'               => __( 'Move to Trash' ),
		'restoreSelected'             => __( 'Restore from Trash' ),
		'deletePermanently'           => __( 'Delete permanently' ),
		'apply'                       => __( 'Apply' ),
		'filterByDate'                => __( 'Filter by date' ),
		'filterByType'                => __( 'Filter by type' ),
		'searchLabel'                 => __( 'Search' ),
		'searchMediaLabel'            => __( 'Search media' ),          // Backward compatibility pre-5.3.
		'searchMediaPlaceholder'      => __( 'Search media items...' ), // Placeholder (no ellipsis), backward compatibility pre-5.3.
		/* translators: %d: Number of attachments found in a search. */
		'mediaFound'                  => __( 'Number of media items found: %d' ),
		'noMedia'                     => __( 'No media items found.' ),
		'noMediaTryNewSearch'         => __( 'No media items found. Try a different search.' ),

		// Library Details.
		'attachmentDetails'           => __( 'Attachment details' ),

		// From URL.
		'insertFromUrlTitle'          => __( 'Insert from URL' ),

		// Featured Images.
		'setFeaturedImageTitle'       => $post_type_object->labels->featured_image,
		'setFeaturedImage'            => $post_type_object->labels->set_featured_image,

		// Gallery.
		'createGalleryTitle'          => __( 'Create gallery' ),
		'editGalleryTitle'            => __( 'Edit gallery' ),
		'cancelGalleryTitle'          => __( '&#8592; Cancel gallery' ),
		'insertGallery'               => __( 'Insert gallery' ),
		'updateGallery'               => __( 'Update gallery' ),
		'addToGallery'                => __( 'Add to gallery' ),
		'addToGalleryTitle'           => __( 'Add to gallery' ),
		'reverseOrder'                => __( 'Reverse order' ),

		// Edit Image.
		'imageDetailsTitle'           => __( 'Image details' ),
		'imageReplaceTitle'           => __( 'Replace image' ),
		'imageDetailsCancel'          => __( 'Cancel edit' ),
		'editImage'                   => __( 'Edit image' ),

		// Crop Image.
		'chooseImage'                 => __( 'Choose image' ),
		'selectAndCrop'               => __( 'Select and crop' ),
		'skipCropping'                => __( 'Skip cropping' ),
		'cropImage'                   => __( 'Crop image' ),
		'cropYourImage'               => __( 'Crop your image' ),
		'cropping'                    => __( 'Cropping&hellip;' ),
		/* translators: 1: Suggested width number, 2: Suggested height number. */
		'suggestedDimensions'         => __( 'Suggested image dimensions: %1$s by %2$s pixels.' ),
		'cropError'                   => __( 'There has been an error cropping your image.' ),

		// Edit Audio.
		'audioDetailsTitle'           => __( 'Audio details' ),
		'audioReplaceTitle'           => __( 'Replace audio' ),
		'audioAddSourceTitle'         => __( 'Add audio source' ),
		'audioDetailsCancel'          => __( 'Cancel edit' ),

		// Edit Video.
		'videoDetailsTitle'           => __( 'Video details' ),
		'videoReplaceTitle'           => __( 'Replace video' ),
		'videoAddSourceTitle'         => __( 'Add video source' ),
		'videoDetailsCancel'          => __( 'Cancel edit' ),
		'videoSelectPosterImageTitle' => __( 'Select poster image' ),
		'videoAddTrackTitle'          => __( 'Add subtitles' ),

		// Playlist.
		'playlistDragInfo'            => __( 'Drag and drop to reorder tracks.' ),
		'createPlaylistTitle'         => __( 'Create audio playlist' ),
		'editPlaylistTitle'           => __( 'Edit audio playlist' ),
		'cancelPlaylistTitle'         => __( '&#8592; Cancel audio playlist' ),
		'insertPlaylist'              => __( 'Insert audio playlist' ),
		'updatePlaylist'              => __( 'Update audio playlist' ),
		'addToPlaylist'               => __( 'Add to audio playlist' ),
		'addToPlaylistTitle'          => __( 'Add to Audio Playlist' ),

		// Video Playlist.
		'videoPlaylistDragInfo'       => __( 'Drag and drop to reorder videos.' ),
		'createVideoPlaylistTitle'    => __( 'Create video playlist' ),
		'editVideoPlaylistTitle'      => __( 'Edit video playlist' ),
		'cancelVideoPlaylistTitle'    => __( '&#8592; Cancel video playlist' ),
		'insertVideoPlaylist'         => __( 'Insert video playlist' ),
		'updateVideoPlaylist'         => __( 'Update video playlist' ),
		'addToVideoPlaylist'          => __( 'Add to video playlist' ),
		'addToVideoPlaylistTitle'     => __( 'Add to video Playlist' ),

		// Headings.
		'filterAttachments'           => __( 'Filter media' ),
		'attachmentsList'             => __( 'Media list' ),
	);

	/**
	 * Filters the media view settings.
	 *
	 * @since 3.5.0
	 *
	 * @param array   $settings List of media view settings.
	 * @param WP_Post $post     Post object.
	 */
	$settings = apply_filters( 'media_view_settings', $settings, $post );

	/**
	 * Filters the media view strings.
	 *
	 * @since 3.5.0
	 *
	 * @param string[] $strings Array of media view strings keyed by the name they'll be referenced by in JavaScript.
	 * @param WP_Post  $post    Post object.
	 */
	$strings = apply_filters( 'media_view_strings', $strings, $post );

	$strings['settings'] = $settings;

	// Ensure we enqueue media-editor first, that way media-views
	// is registered internally before we try to localize it. See #24724.
	wp_enqueue_script( 'media-editor' );
	wp_localize_script( 'media-views', '_wpMediaViewsL10n', $strings );

	wp_enqueue_script( 'media-audiovideo' );
	wp_enqueue_style( 'media-views' );
	if ( is_admin() ) {
		wp_enqueue_script( 'mce-view' );
		wp_enqueue_script( 'image-edit' );
	}
	wp_enqueue_style( 'imgareaselect' );
	wp_plupload_default_settings();

	require_once ABSPATH . WPINC . '/media-template.php';
	add_action( 'admin_footer', 'wp_print_media_templates' );
	add_action( 'wp_footer', 'wp_print_media_templates' );
	add_action( 'customize_controls_print_footer_scripts', 'wp_print_media_templates' );

	/**
	 * Fires at the conclusion of wp_enqueue_media().
	 *
	 * @since 3.5.0
	 */
	do_action( 'wp_enqueue_media' );
}

/**
 * Retrieves media attached to the passed post.
 *
 * @since 3.6.0
 *
 * @param string      $type Mime type.
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return WP_Post[] Array of media attached to the given post.
 */
function get_attached_media( $type, $post = 0 ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return array();
	}

	$args = array(
		'post_parent'    => $post->ID,
		'post_type'      => 'attachment',
		'post_mime_type' => $type,
		'posts_per_page' => -1,
		'orderby'        => 'menu_order',
		'order'          => 'ASC',
	);

	/**
	 * Filters arguments used to retrieve media attached to the given post.
	 *
	 * @since 3.6.0
	 *
	 * @param array   $args Post query arguments.
	 * @param string  $type Mime type of the desired media.
	 * @param WP_Post $post Post object.
	 */
	$args = apply_filters( 'get_attached_media_args', $args, $type, $post );

	$children = get_children( $args );

	/**
	 * Filters the list of media attached to the given post.
	 *
	 * @since 3.6.0
	 *
	 * @param WP_Post[] $children Array of media attached to the given post.
	 * @param string    $type     Mime type of the media desired.
	 * @param WP_Post   $post     Post object.
	 */
	return (array) apply_filters( 'get_attached_media', $children, $type, $post );
}

/**
 * Check the content HTML for a audio, video, object, embed, or iframe tags.
 *
 * @since 3.6.0
 *
 * @param string   $content A string of HTML which might contain media elements.
 * @param string[] $types   An array of media types: 'audio', 'video', 'object', 'embed', or 'iframe'.
 * @return string[] Array of found HTML media elements.
 */
function get_media_embedded_in_content( $content, $types = null ) {
	$html = array();

	/**
	 * Filters the embedded media types that are allowed to be returned from the content blob.
	 *
	 * @since 4.2.0
	 *
	 * @param string[] $allowed_media_types An array of allowed media types. Default media types are
	 *                                      'audio', 'video', 'object', 'embed', and 'iframe'.
	 */
	$allowed_media_types = apply_filters( 'media_embedded_in_content_allowed_types', array( 'audio', 'video', 'object', 'embed', 'iframe' ) );

	if ( ! empty( $types ) ) {
		if ( ! is_array( $types ) ) {
			$types = array( $types );
		}

		$allowed_media_types = array_intersect( $allowed_media_types, $types );
	}

	$tags = implode( '|', $allowed_media_types );

	if ( preg_match_all( '#<(?P<tag>' . $tags . ')[^<]*?(?:>[\s\S]*?<\/(?P=tag)>|\s*\/>)#', $content, $matches ) ) {
		foreach ( $matches[0] as $match ) {
			$html[] = $match;
		}
	}

	return $html;
}

/**
 * Retrieves galleries from the passed post's content.
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Post ID or object.
 * @param bool        $html Optional. Whether to return HTML or data in the array. Default true.
 * @return array A list of arrays, each containing gallery data and srcs parsed
 *               from the expanded shortcode.
 */
function get_post_galleries( $post, $html = true ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return array();
	}

	if ( ! has_shortcode( $post->post_content, 'gallery' ) && ! has_block( 'gallery', $post->post_content ) ) {
		return array();
	}

	$galleries = array();
	if ( preg_match_all( '/' . get_shortcode_regex() . '/s', $post->post_content, $matches, PREG_SET_ORDER ) ) {
		foreach ( $matches as $shortcode ) {
			if ( 'gallery' === $shortcode[2] ) {
				$srcs = array();

				$shortcode_attrs = shortcode_parse_atts( $shortcode[3] );
				if ( ! is_array( $shortcode_attrs ) ) {
					$shortcode_attrs = array();
				}

				// Specify the post ID of the gallery we're viewing if the shortcode doesn't reference another post already.
				if ( ! isset( $shortcode_attrs['id'] ) ) {
					$shortcode[3] .= ' id="' . (int) $post->ID . '"';
				}

				$gallery = do_shortcode_tag( $shortcode );
				if ( $html ) {
					$galleries[] = $gallery;
				} else {
					preg_match_all( '#src=([\'"])(.+?)\1#is', $gallery, $src, PREG_SET_ORDER );
					if ( ! empty( $src ) ) {
						foreach ( $src as $s ) {
							$srcs[] = $s[2];
						}
					}

					$galleries[] = array_merge(
						$shortcode_attrs,
						array(
							'src' => array_values( array_unique( $srcs ) ),
						)
					);
				}
			}
		}
	}

	if ( has_block( 'gallery', $post->post_content ) ) {
		$post_blocks = parse_blocks( $post->post_content );

		while ( $block = array_shift( $post_blocks ) ) {
			$has_inner_blocks = ! empty( $block['innerBlocks'] );

			// Skip blocks with no blockName and no innerHTML.
			if ( ! $block['blockName'] ) {
				continue;
			}

			// All blocks nested inside non-Gallery blocks should be in the root array.
			if ( $has_inner_blocks && 'core/gallery' !== $block['blockName'] ) {
				array_push( $post_blocks, ...$block['innerBlocks'] );
				continue;
			}

			// New Gallery block format as HTML.
			if ( $has_inner_blocks && $html ) {
				$block_html  = wp_list_pluck( $block['innerBlocks'], 'innerHTML' );
				$galleries[] = '<figure>' . implode( ' ', $block_html ) . '</figure>';
				continue;
			}

			$srcs = array();

			// New Gallery block format as an array.
			if ( $has_inner_blocks ) {
				$attrs = wp_list_pluck( $block['innerBlocks'], 'attrs' );
				$ids   = wp_list_pluck( $attrs, 'id' );

				foreach ( $ids as $id ) {
					$url = wp_get_attachment_url( $id );

					if ( is_string( $url ) && ! in_array( $url, $srcs, true ) ) {
						$srcs[] = $url;
					}
				}

				$galleries[] = array(
					'ids' => implode( ',', $ids ),
					'src' => $srcs,
				);

				continue;
			}

			// Old Gallery block format as HTML.
			if ( $html ) {
				$galleries[] = $block['innerHTML'];
				continue;
			}

			// Old Gallery block format as an array.
			$ids = ! empty( $block['attrs']['ids'] ) ? $block['attrs']['ids'] : array();

			// If present, use the image IDs from the JSON blob as canonical.
			if ( ! empty( $ids ) ) {
				foreach ( $ids as $id ) {
					$url = wp_get_attachment_url( $id );

					if ( is_string( $url ) && ! in_array( $url, $srcs, true ) ) {
						$srcs[] = $url;
					}
				}

				$galleries[] = array(
					'ids' => implode( ',', $ids ),
					'src' => $srcs,
				);

				continue;
			}

			// Otherwise, extract srcs from the innerHTML.
			preg_match_all( '#src=([\'"])(.+?)\1#is', $block['innerHTML'], $found_srcs, PREG_SET_ORDER );

			if ( ! empty( $found_srcs[0] ) ) {
				foreach ( $found_srcs as $src ) {
					if ( isset( $src[2] ) && ! in_array( $src[2], $srcs, true ) ) {
						$srcs[] = $src[2];
					}
				}
			}

			$galleries[] = array( 'src' => $srcs );
		}
	}

	/**
	 * Filters the list of all found galleries in the given post.
	 *
	 * @since 3.6.0
	 *
	 * @param array   $galleries Associative array of all found post galleries.
	 * @param WP_Post $post      Post object.
	 */
	return apply_filters( 'get_post_galleries', $galleries, $post );
}

/**
 * Check a specified post's content for gallery and, if present, return the first
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @param bool        $html Optional. Whether to return HTML or data. Default is true.
 * @return string|array Gallery data and srcs parsed from the expanded shortcode.
 */
function get_post_gallery( $post = 0, $html = true ) {
	$galleries = get_post_galleries( $post, $html );
	$gallery   = reset( $galleries );

	/**
	 * Filters the first-found post gallery.
	 *
	 * @since 3.6.0
	 *
	 * @param array       $gallery   The first-found post gallery.
	 * @param int|WP_Post $post      Post ID or object.
	 * @param array       $galleries Associative array of all found post galleries.
	 */
	return apply_filters( 'get_post_gallery', $gallery, $post, $galleries );
}

/**
 * Retrieve the image srcs from galleries from a post's content, if present
 *
 * @since 3.6.0
 *
 * @see get_post_galleries()
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return array A list of lists, each containing image srcs parsed.
 *               from an expanded shortcode
 */
function get_post_galleries_images( $post = 0 ) {
	$galleries = get_post_galleries( $post, false );
	return wp_list_pluck( $galleries, 'src' );
}

/**
 * Checks a post's content for galleries and return the image srcs for the first found gallery
 *
 * @since 3.6.0
 *
 * @see get_post_gallery()
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return string[] A list of a gallery's image srcs in order.
 */
function get_post_gallery_images( $post = 0 ) {
	$gallery = get_post_gallery( $post, false );
	return empty( $gallery['src'] ) ? array() : $gallery['src'];
}

/**
 * Maybe attempts to generate attachment metadata, if missing.
 *
 * @since 3.9.0
 *
 * @param WP_Post $attachment Attachment object.
 */
function wp_maybe_generate_attachment_metadata( $attachment ) {
	if ( empty( $attachment ) || empty( $attachment->ID ) ) {
		return;
	}

	$attachment_id = (int) $attachment->ID;
	$file          = get_attached_file( $attachment_id );
	$meta          = wp_get_attachment_metadata( $attachment_id );

	if ( empty( $meta ) && file_exists( $file ) ) {
		$_meta = get_post_meta( $attachment_id );
		$_lock = 'wp_generating_att_' . $attachment_id;

		if ( ! array_key_exists( '_wp_attachment_metadata', $_meta ) && ! get_transient( $_lock ) ) {
			set_transient( $_lock, $file );
			wp_update_attachment_metadata( $attachment_id, wp_generate_attachment_metadata( $attachment_id, $file ) );
			delete_transient( $_lock );
		}
	}
}

/**
 * Tries to convert an attachment URL into a post ID.
 *
 * @since 4.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $url The URL to resolve.
 * @return int The found post ID, or 0 on failure.
 */
function attachment_url_to_postid( $url ) {
	global $wpdb;

	$dir  = wp_get_upload_dir();
	$path = $url;

	$site_url   = parse_url( $dir['url'] );
	$image_path = parse_url( $path );

	// Force the protocols to match if needed.
	if ( isset( $image_path['scheme'] ) && ( $image_path['scheme'] !== $site_url['scheme'] ) ) {
		$path = str_replace( $image_path['scheme'], $site_url['scheme'], $path );
	}

	if ( 0 === strpos( $path, $dir['baseurl'] . '/' ) ) {
		$path = substr( $path, strlen( $dir['baseurl'] . '/' ) );
	}

	$sql = $wpdb->prepare(
		"SELECT post_id, meta_value FROM $wpdb->postmeta WHERE meta_key = '_wp_attached_file' AND meta_value = %s",
		$path
	);

	$results = $wpdb->get_results( $sql );
	$post_id = null;

	if ( $results ) {
		// Use the first available result, but prefer a case-sensitive match, if exists.
		$post_id = reset( $results )->post_id;

		if ( count( $results ) > 1 ) {
			foreach ( $results as $result ) {
				if ( $path === $result->meta_value ) {
					$post_id = $result->post_id;
					break;
				}
			}
		}
	}

	/**
	 * Filters an attachment ID found by URL.
	 *
	 * @since 4.2.0
	 *
	 * @param int|null $post_id The post_id (if any) found by the function.
	 * @param string   $url     The URL being looked up.
	 */
	return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url );
}

/**
 * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view.
 *
 * @since 4.0.0
 *
 * @return string[] The relevant CSS file URLs.
 */
function wpview_media_sandbox_styles() {
	$version        = 'ver=' . get_bloginfo( 'version' );
	$mediaelement   = includes_url( "js/mediaelement/mediaelementplayer-legacy.min.css?$version" );
	$wpmediaelement = includes_url( "js/mediaelement/wp-mediaelement.css?$version" );

	return array( $mediaelement, $wpmediaelement );
}

/**
 * Registers the personal data exporter for media.
 *
 * @param array[] $exporters An array of personal data exporters, keyed by their ID.
 * @return array[] Updated array of personal data exporters.
 */
function wp_register_media_personal_data_exporter( $exporters ) {
	$exporters['wordpress-media'] = array(
		'exporter_friendly_name' => __( 'WordPress Media' ),
		'callback'               => 'wp_media_personal_data_exporter',
	);

	return $exporters;
}

/**
 * Finds and exports attachments associated with an email address.
 *
 * @since 4.9.6
 *
 * @param string $email_address The attachment owner email address.
 * @param int    $page          Attachment page.
 * @return array An array of personal data.
 */
function wp_media_personal_data_exporter( $email_address, $page = 1 ) {
	// Limit us to 50 attachments at a time to avoid timing out.
	$number = 50;
	$page   = (int) $page;

	$data_to_export = array();

	$user = get_user_by( 'email', $email_address );
	if ( false === $user ) {
		return array(
			'data' => $data_to_export,
			'done' => true,
		);
	}

	$post_query = new WP_Query(
		array(
			'author'         => $user->ID,
			'posts_per_page' => $number,
			'paged'          => $page,
			'post_type'      => 'attachment',
			'post_status'    => 'any',
			'orderby'        => 'ID',
			'order'          => 'ASC',
		)
	);

	foreach ( (array) $post_query->posts as $post ) {
		$attachment_url = wp_get_attachment_url( $post->ID );

		if ( $attachment_url ) {
			$post_data_to_export = array(
				array(
					'name'  => __( 'URL' ),
					'value' => $attachment_url,
				),
			);

			$data_to_export[] = array(
				'group_id'          => 'media',
				'group_label'       => __( 'Media' ),
				'group_description' => __( 'User&#8217;s media data.' ),
				'item_id'           => "post-{$post->ID}",
				'data'              => $post_data_to_export,
			);
		}
	}

	$done = $post_query->max_num_pages <= $page;

	return array(
		'data' => $data_to_export,
		'done' => $done,
	);
}

/**
 * Add additional default image sub-sizes.
 *
 * These sizes are meant to enhance the way WordPress displays images on the front-end on larger,
 * high-density devices. They make it possible to generate more suitable `srcset` and `sizes` attributes
 * when the users upload large images.
 *
 * The sizes can be changed or removed by themes and plugins but that is not recommended.
 * The size "names" reflect the image dimensions, so changing the sizes would be quite misleading.
 *
 * @since 5.3.0
 * @access private
 */
function _wp_add_additional_image_sizes() {
	// 2x medium_large size.
	add_image_size( '1536x1536', 1536, 1536 );
	// 2x large size.
	add_image_size( '2048x2048', 2048, 2048 );
}

/**
 * Callback to enable showing of the user error when uploading .heic images.
 *
 * @since 5.5.0
 *
 * @param array[] $plupload_settings The settings for Plupload.js.
 * @return array[] Modified settings for Plupload.js.
 */
function wp_show_heic_upload_error( $plupload_settings ) {
	$plupload_settings['heic_upload_error'] = true;
	return $plupload_settings;
}

/**
 * Allows PHP's getimagesize() to be debuggable when necessary.
 *
 * @since 5.7.0
 * @since 5.8.0 Added support for WebP images.
 *
 * @param string $filename   The file path.
 * @param array  $image_info Optional. Extended image information (passed by reference).
 * @return array|false Array of image information or false on failure.
 */
function wp_getimagesize( $filename, array &$image_info = null ) {
	// Don't silence errors when in debug mode, unless running unit tests.
	if ( defined( 'WP_DEBUG' ) && WP_DEBUG
		&& ! defined( 'WP_RUN_CORE_TESTS' )
	) {
		if ( 2 === func_num_args() ) {
			$info = getimagesize( $filename, $image_info );
		} else {
			$info = getimagesize( $filename );
		}
	} else {
		/*
		 * Silencing notice and warning is intentional.
		 *
		 * getimagesize() has a tendency to generate errors, such as
		 * "corrupt JPEG data: 7191 extraneous bytes before marker",
		 * even when it's able to provide image size information.
		 *
		 * See https://core.trac.wordpress.org/ticket/42480
		 */
		if ( 2 === func_num_args() ) {
			// phpcs:ignore WordPress.PHP.NoSilencedErrors
			$info = @getimagesize( $filename, $image_info );
		} else {
			// phpcs:ignore WordPress.PHP.NoSilencedErrors
			$info = @getimagesize( $filename );
		}
	}

	if ( false !== $info ) {
		return $info;
	}

	// For PHP versions that don't support WebP images,
	// extract the image size info from the file headers.
	if ( 'image/webp' === wp_get_image_mime( $filename ) ) {
		$webp_info = wp_get_webp_info( $filename );
		$width     = $webp_info['width'];
		$height    = $webp_info['height'];

		// Mimic the native return format.
		if ( $width && $height ) {
			return array(
				$width,
				$height,
				IMAGETYPE_WEBP, // phpcs:ignore PHPCompatibility.Constants.NewConstants.imagetype_webpFound
				sprintf(
					'width="%d" height="%d"',
					$width,
					$height
				),
				'mime' => 'image/webp',
			);
		}
	}

	// The image could not be parsed.
	return false;
}

/**
 * Extracts meta information about a WebP file: width, height, and type.
 *
 * @since 5.8.0
 *
 * @param string $filename Path to a WebP file.
 * @return array {
 *     An array of WebP image information.
 *
 *     @type int|false    $width  Image width on success, false on failure.
 *     @type int|false    $height Image height on success, false on failure.
 *     @type string|false $type   The WebP type: one of 'lossy', 'lossless' or 'animated-alpha'.
 *                                False on failure.
 * }
 */
function wp_get_webp_info( $filename ) {
	$width  = false;
	$height = false;
	$type   = false;

	if ( 'image/webp' !== wp_get_image_mime( $filename ) ) {
		return compact( 'width', 'height', 'type' );
	}

	try {
		$handle = fopen( $filename, 'rb' );
		if ( $handle ) {
			$magic = fread( $handle, 40 );
			fclose( $handle );

			// Make sure we got enough bytes.
			if ( strlen( $magic ) < 40 ) {
				return compact( 'width', 'height', 'type' );
			}

			// The headers are a little different for each of the three formats.
			// Header values based on WebP docs, see https://developers.google.com/speed/webp/docs/riff_container.
			switch ( substr( $magic, 12, 4 ) ) {
				// Lossy WebP.
				case 'VP8 ':
					$parts  = unpack( 'v2', substr( $magic, 26, 4 ) );
					$width  = (int) ( $parts[1] & 0x3FFF );
					$height = (int) ( $parts[2] & 0x3FFF );
					$type   = 'lossy';
					break;
				// Lossless WebP.
				case 'VP8L':
					$parts  = unpack( 'C4', substr( $magic, 21, 4 ) );
					$width  = (int) ( $parts[1] | ( ( $parts[2] & 0x3F ) << 8 ) ) + 1;
					$height = (int) ( ( ( $parts[2] & 0xC0 ) >> 6 ) | ( $parts[3] << 2 ) | ( ( $parts[4] & 0x03 ) << 10 ) ) + 1;
					$type   = 'lossless';
					break;
				// Animated/alpha WebP.
				case 'VP8X':
					// Pad 24-bit int.
					$width = unpack( 'V', substr( $magic, 24, 3 ) . "\x00" );
					$width = (int) ( $width[1] & 0xFFFFFF ) + 1;
					// Pad 24-bit int.
					$height = unpack( 'V', substr( $magic, 27, 3 ) . "\x00" );
					$height = (int) ( $height[1] & 0xFFFFFF ) + 1;
					$type   = 'animated-alpha';
					break;
			}
		}
	} catch ( Exception $e ) {
	}

	return compact( 'width', 'height', 'type' );
}

/**
 * Gets the default value to use for a `loading` attribute on an element.
 *
 * This function should only be called for a tag and context if lazy-loading is generally enabled.
 *
 * The function usually returns 'lazy', but uses certain heuristics to guess whether the current element is likely to
 * appear above the fold, in which case it returns a boolean `false`, which will lead to the `loading` attribute being
 * omitted on the element. The purpose of this refinement is to avoid lazy-loading elements that are within the initial
 * viewport, which can have a negative performance impact.
 *
 * Under the hood, the function uses {@see wp_increase_content_media_count()} every time it is called for an element
 * within the main content. If the element is the very first content element, the `loading` attribute will be omitted.
 * This default threshold of 1 content element to omit the `loading` attribute for can be customized using the
 * {@see 'wp_omit_loading_attr_threshold'} filter.
 *
 * @since 5.9.0
 *
 * @param string $context Context for the element for which the `loading` attribute value is requested.
 * @return string|bool The default `loading` attribute value. Either 'lazy', 'eager', or a boolean `false`, to indicate
 *                     that the `loading` attribute should be skipped.
 */
function wp_get_loading_attr_default( $context ) {
	// Only elements with 'the_content' or 'the_post_thumbnail' context have special handling.
	if ( 'the_content' !== $context && 'the_post_thumbnail' !== $context ) {
		return 'lazy';
	}

	// Only elements within the main query loop have special handling.
	if ( is_admin() || ! in_the_loop() || ! is_main_query() ) {
		return 'lazy';
	}

	// Increase the counter since this is a main query content element.
	$content_media_count = wp_increase_content_media_count();

	// If the count so far is below the threshold, return `false` so that the `loading` attribute is omitted.
	if ( $content_media_count <= wp_omit_loading_attr_threshold() ) {
		return false;
	}

	// For elements after the threshold, lazy-load them as usual.
	return 'lazy';
}

/**
 * Gets the threshold for how many of the first content media elements to not lazy-load.
 *
 * This function runs the {@see 'wp_omit_loading_attr_threshold'} filter, which uses a default threshold value of 1.
 * The filter is only run once per page load, unless the `$force` parameter is used.
 *
 * @since 5.9.0
 *
 * @param bool $force Optional. If set to true, the filter will be (re-)applied even if it already has been before.
 *                    Default false.
 * @return int The number of content media elements to not lazy-load.
 */
function wp_omit_loading_attr_threshold( $force = false ) {
	static $omit_threshold;

	// This function may be called multiple times. Run the filter only once per page load.
	if ( ! isset( $omit_threshold ) || $force ) {
		/**
		 * Filters the threshold for how many of the first content media elements to not lazy-load.
		 *
		 * For these first content media elements, the `loading` attribute will be omitted. By default, this is the case
		 * for only the very first content media element.
		 *
		 * @since 5.9.0
		 *
		 * @param int $omit_threshold The number of media elements where the `loading` attribute will not be added. Default 1.
		 */
		$omit_threshold = apply_filters( 'wp_omit_loading_attr_threshold', 1 );
	}

	return $omit_threshold;
}

/**
 * Increases an internal content media count variable.
 *
 * @since 5.9.0
 * @access private
 *
 * @param int $amount Optional. Amount to increase by. Default 1.
 * @return int The latest content media count, after the increase.
 */
function wp_increase_content_media_count( $amount = 1 ) {
	static $content_media_count = 0;

	$content_media_count += $amount;

	return $content_media_count;
}
