Summery Summery
Compare the existing image sub-sizes (as saved in the attachment meta) to the currently registered image sub-sizes, and return the difference.
Syntax Syntax
Description Description
Registered sub-sizes that are larger than the image are skipped.
Parameters Parameters
- $attachment_id
-
(Required) The image attachment post ID.
Return Return
(array) An array of the image sub-sizes that are currently defined but don't exist for this image.
Source Source
File: wp-admin/includes/image.php
function wp_get_missing_image_subsizes( $attachment_id ) { if ( ! wp_attachment_is_image( $attachment_id ) ) { return array(); } $registered_sizes = wp_get_registered_image_subsizes(); $image_meta = wp_get_attachment_metadata( $attachment_id ); // Meta error? if ( empty( $image_meta ) ) { return $registered_sizes; } // Use the originally uploaded image dimensions as full_width and full_height. if ( ! empty( $image_meta['original_image'] ) ) { $image_file = wp_get_original_image_path( $attachment_id ); $imagesize = @getimagesize( $image_file ); } if ( ! empty( $imagesize ) ) { $full_width = $imagesize[0]; $full_height = $imagesize[1]; } else { $full_width = (int) $image_meta['width']; $full_height = (int) $image_meta['height']; } $possible_sizes = array(); // Skip registered sizes that are too large for the uploaded image. foreach ( $registered_sizes as $size_name => $size_data ) { if ( image_resize_dimensions( $full_width, $full_height, $size_data['width'], $size_data['height'], $size_data['crop'] ) ) { $possible_sizes[ $size_name ] = $size_data; } } if ( empty( $image_meta['sizes'] ) ) { $image_meta['sizes'] = array(); } /* * Remove sizes that already exist. Only checks for matching "size names". * It is possible that the dimensions for a particular size name have changed. * For example the user has changed the values on the Settings -> Media screen. * However we keep the old sub-sizes with the previous dimensions * as the image may have been used in an older post. */ $missing_sizes = array_diff_key( $possible_sizes, $image_meta['sizes'] ); /** * Filters the array of missing image sub-sizes for an uploaded image. * * @since 5.3.0 * * @param array $missing_sizes Array with the missing image sub-sizes. * @param array $image_meta The image meta data. * @param int $attachment_id The image attachment post ID. */ return apply_filters( 'wp_get_missing_image_subsizes', $missing_sizes, $image_meta, $attachment_id ); }
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Changelog Changelog
Version | Description |
---|---|
5.3.0 | Introduced. |