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

    public function validate($vatNumber)
    {
        if (strlen($vatNumber) != 12) {
            return false;
        }
        if ((int) substr($vatNumber, -2) < 1 || (int) substr($vatNumber, -2) > 94) {
            return false;
        }
        $checksum = (int) $vatNumber[9];
        $checkval = 0;
        for ($i = 1; $i < 10; $i++) {
            $checkval += $this->crossSum((int) $vatNumber[9 - $i] * ($this->isEven($i) ? 1 : 2));
        }
        if ($checksum != ($checkval % 10 == 0 ? 0 : 10 - $checkval % 10)) {
            return false;
        }
        return true;
    }