Source Reference:

• Component: bbPress :: bbp-topic

  File: /bbp-includes/bbp-topic-template.php :: Trac Source Line: 1387

  	 * @uses bbp_get_topic_forum_id() To get topic's forum id
  	 * @uses apply_filters() Calls 'bbp_get_topic_forum' with the forum
  	 *                        title and topic id
  	 * @return string Topic forum title
  	 */
  	function bbp_get_topic_forum_title( $topic_id = 0 ) {
  		$topic_id = bbp_get_topic_id( $topic_id );
  		$forum_id = bbp_get_topic_forum_id( $topic_id );
  
  		return apply_filters( 'bbp_get_topic_forum', bbp_get_forum_title( $forum_id ), $topic_id );
  	}
  
  /**
   * Output the forum id a topic belongs to
   *
   * @since bbPress (r2491)
   *
   * @param int $topic_id Optional. Topic id
   * @uses bbp_get_topic_forum_id()
   */