post_thumbnail_url – Hook | Developer.WordPress.org

apply_filters( ‘post_thumbnail_url’, string|false $thumbnail_url, int|WP_Post|null $post, string|int[] $size )

Filters the post thumbnail URL.

Parameters

$thumbnail_urlstring|false: Post thumbnail URL or false if the post does not exist.
$postint|WP_Post|null: Post ID or WP_Post object. Default is global $post.
$sizestring|int[]: 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 );

Used by	Description
get_the_post_thumbnail_url()`wp-includes/post-thumbnail-template.php`	Returns the post thumbnail URL.

Version	Description
5.9.0	Introduced.

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