code: public function getPropertiesAsString()
      {
          $result = '';
  
          $rFunction = new ReflectionFunction($this->parameterClosure);
          if ($rFunction->isVariadic()) {
              $result .= '<'.
              $rFunction->getParameters()[0]->getName().', ...>';
          } else {
              for ($i = 0; $i < count($rFunction->getParameters()); $i++) {
                  $result .= ($result == '' ? '' : ' ').'<'.
                  $rFunction->getParameters()[$i]->getName().
                  '>';
              }
          }
  
          return $result;
      }
docs: Retrieve the properties for this parameter as a string.
  
  @return string