processParameterBag example

  public static function sanitize(Request $request, array $safe_keys, $log_sanitized_keys = FALSE) {
    if (!$request->attributes->get(self::SANITIZED, FALSE)) {
      $update_globals = FALSE;
      $bags = [
        'query' => 'Potentially unsafe keys removed from query string parameters (GET): %s',
        'request' => 'Potentially unsafe keys removed from request body parameters (POST): %s',
        'cookies' => 'Potentially unsafe keys removed from cookie parameters: %s',
      ];
      foreach ($bags as $bag => $message) {
        if (static::processParameterBag($request->$bag, $safe_keys, $log_sanitized_keys, $bag, $message)) {
          $update_globals = TRUE;
        }
      }
      if ($update_globals) {
        $request->overrideGlobals();
      }
      $request->attributes->set(self::SANITIZED, TRUE);
    }
    return $request;
  }