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