DragonBe\Vies\Validator\ValidatorSK::validate PHP Method

    public function validate($vatNumber)
    {
        if (strlen($vatNumber) != 10) {
            return false;
        }
        if (intval($vatNumber[0]) == 0) {
            return false;
        }
        if ((int) $vatNumber[2] == 0 || (int) $vatNumber[2] == 1 || (int) $vatNumber[2] == 5 || (int) $vatNumber[2] == 6) {
            return false;
        }
        if ($vatNumber % 11 != 0) {
            return false;
        }
        return true;
    }