validate PHP serialization

  public static function check($checking_key, $data) {
    try {
      serialize($data);
    }
    catch (\Throwable $e) {
      // The data fucked up. Go into it to see where.
      ddm("CATCH $checking_key");
      if (is_array($data)) {
        foreach ($data as $key => $val) {
          static::check($key, $val);
        }
      }
      elseif (is_object($data)) {
        $ref = new \ReflectionObject($data);

        foreach ($ref->getProperties() as $property) {
          $property->setAccessible(TRUE);
          $key = $property->getName();
          $val = $property->getValue($data);
          $arg = 1;
          static::check($key, $val);
        }
      }
      else {
        ddm("FINAL $checking_key");
        return;
      }
    }
  }