Determines whether a post has an image attached.
For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.
function has_post_thumbnail( $post = null ) {
$thumbnail_id = get_post_thumbnail_id( $post );
$has_thumbnail = (bool) $thumbnail_id;
/**
* Filters whether a post has a post thumbnail.
*
* @since 5.1.0
*
* @param bool $has_thumbnail true if the post has a post thumbnail, otherwise false.
* @param int|WP_Post|null $post Post ID or WP_Post object. Default is global `$post`.
* @param int|false $thumbnail_id Post thumbnail ID or false if the post does not exist.
*/
return (bool) apply_filters( 'has_post_thumbnail', $has_thumbnail, $post, $thumbnail_id );
}
Filters whether a post has a post thumbnail.
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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/has_post_thumbnail