public function variable(Array $namespaces): string {
    $value = "";
    if (count($namespaces)) {
      for ($index = 0; $index < count($_SERVER['argv']); $index++) {
        if (!is_object($_SERVER['argv'][$index]) && in_array($_SERVER['argv'][$index], $namespaces)) {
          $value = "";
          if (isset($_SERVER['argv'][++$index])) {
            $value = $_SERVER['argv'][$index];
          }
          break;
        }
      }
    }
    return $value;
  }