diff --git a/src/wp-includes/media.php b/src/wp-includes/media.php
index fc69bdcdc8..7935245d52 100644
--- a/src/wp-includes/media.php
+++ b/src/wp-includes/media.php
@@ -811,17 +811,21 @@ function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = fa
$attr = wp_parse_args( $attr, $default_attr );
- // Generate srcset and sizes if not already present.
+ // Generate 'srcset' and 'sizes' if not already present.
if ( empty( $attr['srcset'] ) ) {
$image_meta = wp_get_attachment_metadata( $attachment_id );
- $size_array = array( absint( $width ), absint( $height ) );
- $sources = wp_calculate_image_srcset( $src, $size_array, $image_meta, $attachment_id );
- if ( count( $sources ) > 1 ) {
- $attr['srcset'] = wp_image_srcset_attr( $sources, $size_array, $image_meta, $attachment_id );
+ if ( is_array( $image_meta ) ) {
+ $size_array = array( absint( $width ), absint( $height ) );
+ $sources = wp_calculate_image_srcset( $src, $size_array, $image_meta, $attachment_id );
+ $sizes = wp_get_attachment_image_sizes( $size_array, $image_meta, $attachment_id );
- if ( empty( $attr['sizes'] ) && ( $sizes = wp_get_attachment_image_sizes( $size_array, $image_meta, $attachment_id ) ) ) {
- $attr['sizes'] = $sizes;
+ if ( count( $sources ) > 1 && ( $sizes || ! empty( $attr['sizes'] ) ) ) {
+ $attr['srcset'] = wp_image_srcset_attr( $sources, $size_array, $image_meta, $attachment_id );
+
+ if ( empty( $attr['sizes'] ) ) {
+ $attr['sizes'] = $sizes;
+ }
}
}
}
@@ -906,7 +910,7 @@ function _wp_get_image_size_from_meta( $size, $image_meta ) {
* @param int $attachment_id Optional. Image attachment ID.
* @param array|string $size Image size. Accepts any valid image size, or an array of width and height
* values in pixels (in that order). Default 'medium'.
- * @param array $image_meta Optional. The image meta data.
+ * @param array $image_meta Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
* @return string|bool A 'srcset' value string or false.
*/
function wp_get_attachment_image_srcset( $attachment_id, $size = 'medium', $image_meta = null ) {
@@ -924,10 +928,10 @@ function wp_get_attachment_image_srcset( $attachment_id, $size = 'medium', $imag
absint( $image[2] )
);
- // Calculate the sources for the srcset.
+ // Calculate the sources for the 'srcset'.
$sources = wp_calculate_image_srcset( $image_url, $size_array, $image_meta, $attachment_id );
- // Only return a srcset value if there is more than one source.
+ // Only return a 'srcset' value if there is more than one source.
if ( count( $sources ) < 2 ) {
return false;
}
@@ -937,15 +941,15 @@ function wp_get_attachment_image_srcset( $attachment_id, $size = 'medium', $imag
/**
- * A helper function to concatenate and filter the srcset attribute value.
+ * A helper function to concatenate and filter the 'srcset' attribute value.
*
* @since 4.4.0
*
- * @param array $sources The array containing image sizes data as returned by wp_calculate_image_srcset().
+ * @param array $sources The array containing image sizes data as returned by 'wp_calculate_image_srcset()'.
* @param array $size_array Array of width and height values in pixels (in that order).
- * @param array $image_meta The image meta data.
- * @param int $attachment_id The image attachment post id to pass to the filter.
- * @return string The srcset attribute value.
+ * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'.
+ * @param int $attachment_id The image attachment ID to pass to the filter.
+ * @return string The 'srcset' attribute value.
*/
function wp_image_srcset_attr( $sources, $size_array, $image_meta, $attachment_id ) {
$srcset = '';
@@ -955,40 +959,39 @@ function wp_image_srcset_attr( $sources, $size_array, $image_meta, $attachment_i
}
/**
- * Filter the output of wp_get_attachment_image_srcset().
+ * Filter the output of 'wp_image_srcset_attr()'.
*
* @since 4.4.0
*
- * @param string $srcset A source set formatted for a `srcset` attribute.
+ * @param string $srcset A source set formatted for a 'srcset' attribute.
* @param int $attachment_id Image attachment ID.
- * @param array|string $size Image size. Accepts any valid image size, or an array of width and height
- * values in pixels (in that order). Default 'medium'.
- * @param array $image_meta The image meta data.
+ * @param array|string $size Image size. Image size name, or an array of width and height
+ * values in pixels (in that order).
+ * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'.
*/
- return apply_filters( 'wp_get_attachment_image_srcset', rtrim( $srcset, ', ' ), $attachment_id, $size_array, $image_meta );
+ return apply_filters( 'wp_image_srcset', rtrim( $srcset, ', ' ), $attachment_id, $size_array, $image_meta );
}
/**
- * A helper function to caclulate the image sources to include in a srcset attribute.
+ * A helper function to calculate the image sources to include in a 'srcset' attribute.
*
* @since 4.4.0
*
- * @param string $image_name The file name, path, URL or partial path or URL of the image being matched.
+ * @param string $image_name The file name, path, URL, or partial path or URL, of the image being matched.
* @param array $size_array Array of width and height values in pixels (in that order).
- * @param array $image_meta The image meta data.
- * @param int $attachment_id Optional. The image attachment post id to pass to the filter.
+ * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'.
+ * @param int $attachment_id Optional. The image attachment ID to pass to the filter.
* @return array|bool $sources {
* Array image candidate values containing a URL, descriptor type, and
* descriptor value. False if none exist.
*
* @type array $values {
* @type string $url An image URL.
- * @type string $descriptor A width or density descriptor used in a srcset.
+ * @type string $descriptor A width or density descriptor used in a 'srcset'.
* @type int $value The descriptor value representing a width or
* or pixel density.
* }
* }
- *
*/
function wp_calculate_image_srcset( $image_name, $size_array, $image_meta, $attachment_id = 0 ) {
if ( empty( $image_meta['sizes'] ) ) {
@@ -997,7 +1000,7 @@ function wp_calculate_image_srcset( $image_name, $size_array, $image_meta, $atta
$image_sizes = $image_meta['sizes'];
- // Get the height and width for the image.
+ // Get the width and height of the image.
$image_width = (int) $size_array[0];
$image_height = (int) $size_array[1];
@@ -1006,7 +1009,7 @@ function wp_calculate_image_srcset( $image_name, $size_array, $image_meta, $atta
return false;
}
- // Add full size to the img_sizes array.
+ // Add full size to the '$img_sizes' array.
$image_sizes['full'] = array(
'width' => $image_meta['width'],
'height' => $image_meta['height'],
@@ -1031,14 +1034,14 @@ function wp_calculate_image_srcset( $image_name, $size_array, $image_meta, $atta
$image_edited = preg_match( '/-e[0-9]{13}/', $image_name, $image_edit_hash );
/**
- * Filter the maximum width included in a 'srcset' attribute.
+ * Filter the maximum image width to be included in a 'srcset' attribute.
*
* @since 4.4.0
*
- * @param int $max_width The maximum width to include in the 'srcset'. Default '1600'.
- * @param array|string $size_array Array of width and height values in pixels (in that order).
+ * @param int $max_width The maximum image width to be included in the 'srcset'. Default '1600'.
+ * @param array $size_array Array of width and height values in pixels (in that order).
*/
- $max_srcset_width = apply_filters( 'max_srcset_image_width', 1600, $size_array );
+ $max_srcset_image_width = apply_filters( 'max_srcset_image_width', 1600, $size_array );
// Array to hold URL candidates.
$sources = array();
@@ -1054,8 +1057,8 @@ function wp_calculate_image_srcset( $image_name, $size_array, $image_meta, $atta
continue;
}
- // Filter out images that are wider than $max_srcset_width.
- if ( $max_srcset_width && $image['width'] > $max_srcset_width ) {
+ // Filter out images that are wider than '$max_srcset_image_width'.
+ if ( $max_srcset_image_width && $image['width'] > $max_srcset_image_width ) {
continue;
}
@@ -1080,30 +1083,30 @@ function wp_calculate_image_srcset( $image_name, $size_array, $image_meta, $atta
}
/**
- * Filter the output of wp_get_attachment_image_srcset_array().
+ * Filter the output of 'wp_calculate_image_srcset()'.
*
* @since 4.4.0
*
* @param array $sources An array of image URLs and widths.
- * @param int $attachment_id Attachment ID for image.
- * @param array|string $size Image size. Accepts any valid image size, or an array of width and height
- * values in pixels (in that order). Default 'medium'.
- * @param array $image_meta The image meta data.
+ * @param int $attachment_id Image attachment ID.
+ * @param array|string $size Image size. Image size name, or an array of width and height
+ * values in pixels (in that order).
+ * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'.
*/
- return apply_filters( 'wp_get_attachment_image_srcset_array', array_values( $sources ), $attachment_id, $size_array, $image_meta );
+ return apply_filters( 'wp_calculate_image_srcset', array_values( $sources ), $attachment_id, $size_array, $image_meta );
}
/**
- * Create `sizes` attribute value for an image.
+ * Create 'sizes' attribute value for an image.
*
* @since 4.4.0
*
- * @param array|string $size Image size. Accepts any valid image size name (thumbnail, medium, etc.),
+ * @param array|string $size Image size. Accepts any valid image size name ('thumbnail', 'medium', etc.),
* or an array of width and height values in pixels (in that order).
- * @param array $image_meta Optional. The image meta data.
- * @param int $attachment_id Optional. Image attachment ID. Either $image_meta or $attachment_id is needed
- * when using image size name.
+ * @param array $image_meta Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
+ * @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`.
*
* @return string|bool A valid source size value for use in a 'sizes' attribute or false.
*/
@@ -1119,10 +1122,10 @@ function wp_get_attachment_image_sizes( $size, $image_meta = null, $attachment_i
$image_meta = wp_get_attachment_metadata( $attachment_id );
}
- if ( $image_meta ) {
+ if ( is_array( $image_meta ) ) {
$width = _wp_get_image_size_from_meta( $size, $image_meta );
if ( $width ) {
- $width = $width[0];
+ $width = absint( $width[0] );
}
}
}
@@ -1131,19 +1134,19 @@ function wp_get_attachment_image_sizes( $size, $image_meta = null, $attachment_i
return false;
}
- // Setup the default sizes attribute.
- $sizes = sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', (int) $width );
+ // Setup the default 'sizes' attribute.
+ $sizes = sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $width );
/**
- * Filter the output of wp_get_attachment_image_sizes().
+ * Filter the output of 'wp_get_attachment_image_sizes()'.
*
* @since 4.4.0
*
* @param string $sizes A source size value for use in a 'sizes' attribute.
- * @param array|string $size Image size. Accepts any valid image size, or an array of width and height
- * values in pixels (in that order). Default 'medium'.
- * @param array $image_meta The image meta data.
- * @param int $attachment_id Post ID of the original image.
+ * @param array|string $size Image size. Image size name, or an array of width and height
+ * values in pixels (in that order).
+ * @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'.
+ * @param int $attachment_id Image attachment ID of the original image.
*/
return apply_filters( 'wp_get_attachment_image_sizes', $sizes, $size, $image_meta, $attachment_id );
}
@@ -1153,7 +1156,7 @@ function wp_get_attachment_image_sizes( $size, $image_meta = null, $attachment_i
*
* @since 4.4.0
*
- * @see wp_image_add_srcset_and_sizes()
+ * @see 'wp_image_add_srcset_and_sizes()'
*
* @param string $content The raw post content to be filtered.
* @return string Converted content with 'srcset' and 'sizes' attributes added to images.
@@ -1167,8 +1170,10 @@ function wp_make_content_images_responsive( $content ) {
if ( false === strpos( $image, ' srcset="' ) && preg_match( '/wp-image-([0-9]+)/i', $image, $class_id ) &&
( $attachment_id = absint( $class_id[1] ) ) ) {
- // If exactly the same image tag is used more than once, overwrite it.
- // All identical tags will be replaced later with str_replace().
+ /*
+ * If exactly the same image tag is used more than once, overwrite it.
+ * All identical tags will be replaced later with 'str_replace()'.
+ */
$selected_images[ $image ] = $attachment_id;
// Overwrite the ID when the same image is included more than once.
$attachment_ids[ $attachment_id ] = true;
@@ -1177,7 +1182,7 @@ function wp_make_content_images_responsive( $content ) {
if ( count( $attachment_ids ) > 1 ) {
/*
- * Warm object cache for use with get_post_meta().
+ * Warm object cache for use with 'get_post_meta()'.
*
* To avoid making a database call for each image, a single query
* warms the object cache with the meta information for all images.
@@ -1198,16 +1203,16 @@ function wp_make_content_images_responsive( $content ) {
*
* @since 4.4.0
*
- * @see wp_get_attachment_image_srcset()
- * @see wp_get_attachment_image_sizes()
+ * @see 'wp_get_attachment_image_srcset()'
+ * @see 'wp_get_attachment_image_sizes()'
*
* @param string $image An HTML 'img' element to be filtered.
- * @param array $image_meta The image meta data.
+ * @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.
+ * @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
+ // Ensure the image meta exists.
if ( empty( $image_meta['sizes'] ) ) {
return $image;
}
@@ -1215,12 +1220,12 @@ function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
$src = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
list( $src ) = explode( '?', $src );
- // Return early if we coudn't get the image source.
+ // Return early if we couldn't get the image source.
if ( ! $src ) {
return $image;
}
- // Bail early when an image has been inserted and later edited.
+ // 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( $src ), $img_edit_hash[0] ) === false ) {
@@ -1232,8 +1237,8 @@ function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
if ( ! $width || ! $height ) {
/*
- * If attempts to parse the size value failed, attempt to use the image
- * metadata to match the image file name from 'src' against the available sizes for an attachment.
+ * If attempts to parse the size value failed, attempt to use the image meta data to match
+ * the image file name from 'src' against the available sizes for an attachment.
*/
$image_filename = wp_basename( $src );
@@ -1259,17 +1264,17 @@ function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
$sources = wp_calculate_image_srcset( $src, $size_array, $image_meta, $attachment_id );
$srcset = $sizes = '';
- // Only calculate srcset and sizes values if there is more than one source.
+ // Only calculate 'srcset' and 'sizes' values if there is more than one source.
if ( count( $sources ) > 1 ) {
$srcset = wp_image_srcset_attr( $sources, $size_array, $image_meta, $attachment_id );
$sizes = wp_get_attachment_image_sizes( $size_array, $image_meta, $attachment_id );
}
if ( $srcset && $sizes ) {
- // Format the srcset and sizes string and escape attributes.
+ // Format the 'srcset' and 'sizes' string and escape attributes.
$srcset_and_sizes = sprintf( ' srcset="%s" sizes="%s"', esc_attr( $srcset ), esc_attr( $sizes ) );
- // Add srcset and sizes attributes to the image markup.
+ // Add 'srcset' and 'sizes' attributes to the image markup.
$image = preg_replace( '/
]+?)[\/ ]*>/', '
', $image );
}