wp-includes/post-thumbnail-template.php:250Returns the post thumbnail URL.
$postint|WP_Postoptionalnull$sizestring|int[]optional'post-thumbnail'string|falseOne hook fires while get_the_post_thumbnail_url() runs, in this order:
Filters the post thumbnail URL.
function get_the_post_thumbnail_url( $post = null, $size = 'post-thumbnail' ) { $post_thumbnail_id = get_post_thumbnail_id( $post ); if ( ! $post_thumbnail_id ) { return false; } $thumbnail_url = wp_get_attachment_image_url( $post_thumbnail_id, $size ); /** * Filters the post thumbnail URL. * * @since 5.9.0 * * @param string|false $thumbnail_url Post thumbnail URL or false if the post does not exist. * @param int|WP_Post|null $post Post ID or WP_Post object. Default is global `$post`. * @param string|int[] $size Registered image size to retrieve the source for or a flat array * of height and width dimensions. Default 'post-thumbnail'. */ return apply_filters( 'post_thumbnail_url', $thumbnail_url, $post, $size );}Introduced in 4.4.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$post retyped from int|WP_Post to int|WP_Post|null.verified against sourcesrc/wp-includes/post-thumbnail-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.