71 lines
2.0 KiB
PHP
71 lines
2.0 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Validator\Constraints;
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use Symfony\Component\Validator\Constraint;
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use Symfony\Component\Validator\ConstraintValidator;
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use Symfony\Component\Validator\Exception\UnexpectedTypeException;
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/**
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* Validates a PAN using the LUHN Algorithm
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*
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* For a list of example card numbers that are used to test this
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* class, please see the LuhnValidatorTest class.
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*
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* @see http://en.wikipedia.org/wiki/Luhn_algorithm
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* @author Tim Nagel <t.nagel@infinite.net.au>
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* @author Greg Knapp http://gregk.me/2011/php-implementation-of-bank-card-luhn-algorithm/
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*/
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class LuhnValidator extends ConstraintValidator
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{
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/**
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* Validates a creditcard number with the Luhn algorithm.
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*
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* @param mixed $value
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* @param Constraint $constraint
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*/
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public function validate($value, Constraint $constraint)
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{
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if (!$constraint instanceof Luhn) {
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throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Luhn');
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}
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if (null === $value || '' === $value) {
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return;
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}
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/**
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* need to work with strings only because long numbers are treated as floats and don't work with strlen
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*/
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if (!is_string($value)) {
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throw new UnexpectedTypeException($value, 'string');
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}
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if (!is_numeric($value)) {
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$this->context->addViolation($constraint->message);
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return;
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}
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$length = strlen($value);
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$oddLength = $length % 2;
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for ($sum = 0, $i = $length - 1; $i >= 0; $i--) {
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$digit = (int) $value[$i];
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$sum += (($i % 2) === $oddLength) ? array_sum(str_split($digit * 2)) : $digit;
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}
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if ($sum === 0 || ($sum % 10) !== 0) {
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$this->context->addViolation($constraint->message);
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}
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}
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}
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