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

    public function validate($vatNumber)
    {
        if (strlen($vatNumber) != 11) {
            return false;
        }
        if (strpos($this->alphabet, $vatNumber[0]) === false) {
            return false;
        }
        if (strpos($this->alphabet, $vatNumber[1]) === false) {
            return false;
        }
        $checksum = substr($vatNumber, 0, 2);
        if (ctype_digit($checksum)) {
            $checkval = $this->validateOld($vatNumber);
        } else {
            $checkval = $this->validateNew($vatNumber);
        }
        if ($checksum != $checkval) {
            return false;
        }
        return true;
    }