Filters the post thumbnail URL.

$thumbnail_url string|false

Post thumbnail URL or false if the post does not exist.

$post int|WP_Post|null

Post ID or WP_Post object. Default is global $post.

$size string|int[]

Registered image size to retrieve the source for or a flat array of height and width dimensions. Default 'post-thumbnail'.

File: wp-includes/post-thumbnail-template.php. View all references

return apply_filters( 'post_thumbnail_url', $thumbnail_url, $post, $size );