Source Reference:

• Component: bbPress:: bbp-forum

  File: /bbp-includes/bbp-forum-functions.php :: Trac Source Line: 163

   *
   * @param int $forum_id Optional. Forum id
   * @uses update_post_meta() To update the forum category meta
   * @return bool False on failure, true on success
   */
  function bbp_categorize_forum( $forum_id = 0 ) {
  
  	$forum_id = bbp_get_forum_id( $forum_id );
  
  	do_action( 'bbp_categorize_forum',  $forum_id );
  
  	update_post_meta( $forum_id, '_bbp_forum_type', 'category' );
  
  	do_action( 'bbp_categorized_forum', $forum_id );
  
  	return $forum_id;
  }
  
  /**
   * Remove the category status from a forum