code: private function getRealName($param)
      {
          $parameterClosure = $this->getParameterClosure($param);
          if ($parameterClosure->parent != null) {
              return $parameterClosure->parent->parameterName;
          } else {
              return $parameterClosure->parameterName;
          }
      }
docs: Retrieves the real name that will be displayed in
  the results for a parameter.
  
  @return string