/**
  * Exporter instance for variables
  * 
  * @return \SebastianBergmann\Exporter\Exporter
  */
 public static function getExporter()
 {
     if (self::$_exporter === null) {
         self::$_exporter = new \SebastianBergmann\Exporter\Exporter();
     }
     return self::$_exporter;
 }