7005*7006* @since 2.1.07007*7008* @param string$thumbnail_urlURLfor the attachment thumbnail.7009* @param int$post_id Attachment ID.7010*/7011returnapply_filters('wp_get_attachment_thumb_url',$thumbnail_url,$post_id);7012}70137014/**7015* Verifies an attachment is of a given type.7016*7017* @since 4.2.0
History
Introduced in 2.1.0. Unchanged from 6.7.7 through 7.1.0.