Source Reference:

• Component: bbPress :: bbp-user

  File: /bbp-includes/bbp-user-functions.php :: Trac Source Line: 186

   */
  function bbp_get_topic_favoriters( $topic_id = 0 ) {
  	if ( empty( $topic_id ) )
  		return;
  
  	global $wpdb;
  
  	// Get the users who have favorited the topic
  	$users = $wpdb->get_col( "SELECT user_id FROM {$wpdb->usermeta} WHERE meta_key = '_bbp_favorites' and FIND_IN_SET('{$topic_id}', meta_value) > 0" );
  	$users = apply_filters( 'bbp_get_topic_favoriters', $users, $topic_id );
  
  	if ( !empty( $users ) )
  		return $users;
  
  	return false;
  }
  
  /**
   * Get a user's favorite topics
   *