code: public function files($key = null, $name = null)
      {
          if (is_null($key)) {
              return $_FILES;
          }
  
          if (isset($_FILES[$key])) {
              if (! is_null($name)) {
                  return $_FILES[$key][$name];
              }
  
              return $_FILES[$key];
          }
  
          return false;
      }
docs: HTTP FILES Request
  
  @param string $key
  @param string $name
  
  @return mixed