Alert: This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.
_wp_preview_post_thumbnail_filter() WordPress Function
The _wp_preview_post_thumbnail_filter() function allows you to override the default thumbnail image for a post when it is displayed in the "Preview" mode. This can be useful if you want to use a different image for the post when it is displayed in the "Preview" mode.
_wp_preview_post_thumbnail_filter( null|array|string $value, int $post_id, string $meta_key ) #
Filters post thumbnail lookup to set the post thumbnail.
Parameters
- $value
(null|array|string)(Required)The value to return
- a single metadata value, or an array of values.
- $post_id
(int)(Required)Post ID.
- $meta_key
(string)(Required)Meta key.
Return
(null|array) The default return value or the post thumbnail meta array.
Source
File: wp-includes/revision.php
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 | function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) { $post = get_post(); if ( ! $post ) { return $value; } if ( empty( $_REQUEST['_thumbnail_id'] ) || empty( $_REQUEST['preview_id'] ) || $post->ID != $post_id || '_thumbnail_id' !== $meta_key || 'revision' === $post->post_type || $post_id != $_REQUEST['preview_id'] ) { return $value; } $thumbnail_id = (int) $_REQUEST['_thumbnail_id']; if ( $thumbnail_id <= 0 ) { return ''; } return (string) $thumbnail_id;} |
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Changelog
| Version | Description |
|---|---|
| 4.6.0 | Introduced. |