'publish_posts', ) ); $follower_inboxes_all = []; foreach ( $authors as $user ) { $follower_inboxes = Followers::get_inboxes( $user->ID ); $follower_inboxes_all = array_merge( $follower_inboxes, $follower_inboxes_all ); } return array_unique( array_filter( $follower_inboxes_all ) ); } }