bbp_get_forum_last_topic_author_link( int $forum_id )

	function bbp_get_forum_last_topic_author_link( $forum_id = 0 ) {
		$forum_id    = bbp_get_forum_id( $forum_id );
		$author_id   = bbp_get_forum_last_topic_author_id( $forum_id );
		$author_link = bbp_get_user_profile_link( $author_id );
		return apply_filters( 'bbp_get_forum_last_topic_author_link', $author_link, $forum_id );
	}