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'.

Source

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

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