bbp_unstick_topic( int $topic_id )

function bbp_unstick_topic( $topic_id = 0 ) {
	$topic_id = bbp_get_topic_id( $topic_id );
	$super    = bbp_is_topic_super_sticky( $topic_id );
	$forum_id = empty( $super ) ? bbp_get_topic_forum_id( $topic_id ) : 0;
	$stickies = bbp_get_stickies( $forum_id );
	$offset   = array_search( $topic_id, $stickies );

	do_action( 'bbp_unstick_topic', $topic_id );

	if ( empty( $stickies ) ) {
		$success = true;
	} elseif ( !in_array( $topic_id, $stickies ) ) {
		$success = true;
	} elseif ( false === $offset ) {
		$success = true;
	} else {
		array_splice( $stickies, $offset, 1 );
		if ( empty( $stickies ) ) {
			$success = !empty( $super ) ? delete_option( '_bbp_super_sticky_topics'            ) : delete_post_meta( $forum_id, '_bbp_sticky_topics'            );
		} else {
			$success = !empty( $super ) ? update_option( '_bbp_super_sticky_topics', $stickies ) : update_post_meta( $forum_id, '_bbp_sticky_topics', $stickies );
		}
	}

	do_action( 'bbp_unsticked_topic', $topic_id, $success );

	return (bool) $success;
}