Source Reference:

• Component: bbPress:: bbp-forum

  File: /bbp-includes/bbp-forum-functions.php :: Trac Source Line: 362

  		$hidden[] = $forum_id;
  		update_option( '_bbp_hidden_forums', array_unique( array_values( $hidden ) ) );
  
  		// Update forums visibility setting
  		global $wpdb;
  		$wpdb->update( $wpdb->posts, array( 'post_status' => bbp_get_hidden_status_id() ), array( 'ID' => $forum_id ) );
  		wp_transition_post_status( bbp_get_hidden_status_id(), $current_visibility, get_post( $forum_id ) );
  	}
  
  	do_action( 'bbp_hid_forum',  $forum_id );
  
  	return $forum_id;
  }
  
  /** Forum Updaters ************************************************************/
  
  /**
   * Update the forum last topic id
   *
   * @since bbPress (r2625)