DragonBe\Vies\Validator\ValidatorFR::validateOld PHP 메소드

    private function validateOld($vatNumber)
    {
        $checkval = substr($vatNumber, 2);
        $checkval .= "12";
        $checkval = intval($checkval) % 97;
        return $checkval == 0 ? "00" : $checkval;
    }