/**
  * @return string
  */
 public function __toString()
 {
     $options = array_map(function ($optionValue) {
         return sprintf('%s %s', parent::__toString(), escapeshellarg($optionValue));
     }, $this->optionValues);
     return implode(' ', $options);
 }
 /**
  * @return string
  */
 public function __toString()
 {
     return sprintf('%s %s', parent::__toString(), escapeshellarg($this->getOptionValue()));
 }