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name : CardSchemeValidator.php
 <?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 that a card number belongs to a specified scheme.
 *
 * @see http://en.wikipedia.org/wiki/Bank_card_number
 * @see http://www.regular-expressions.info/creditcard.html
 * @author Tim Nagel <t.nagel@infinite.net.au>
 */
class CardSchemeValidator extends ConstraintValidator
{
    protected $schemes = array(
        /**
         * American Express card numbers start with 34 or 37 and have 15 digits.
         */
        'AMEX' => array(
            '/^3[47][0-9]{13}$/'
        ),
        /**
         * China UnionPay cards start with 62 and have between 16 and 19 digits.
         * Please note that these cards do not follow Luhn Algorithm as a checksum.
         */
        'CHINA_UNIONPAY' => array(
            '/^62[0-9]{14,17}$/'
        ),
        /**
         * Diners Club card numbers begin with 300 through 305, 36 or 38. All have 14 digits.
         * There are Diners Club cards that begin with 5 and have 16 digits.
         * These are a joint venture between Diners Club and MasterCard, and should be processed like a MasterCard.
         */
        'DINERS' => array(
            '/^3(?:0[0-5]|[68][0-9])[0-9]{11}$/',
        ),
        /**
         * Discover card numbers begin with 6011, 622126 through 622925, 644 through 649 or 65.
         * All have 16 digits
         */
        'DISCOVER' => array(
            '/^6011[0-9]{12}$/',
            '/^64[4-9][0-9]{13}$/',
            '/^65[0-9]{14}$/',
            '/^622(12[6-9]|1[3-9][0-9]|[2-8][0-9][0-9]|91[0-9]|92[0-5])[0-9]{10}$/'
        ),
        /**
         * InstaPayment cards begin with 637 through 639 and have 16 digits
         */
        'INSTAPAYMENT' => array(
            '/^63[7-9][0-9]{13}$/'
        ),
        /**
         * JCB cards beginning with 2131 or 1800 have 15 digits.
         * JCB cards beginning with 35 have 16 digits.
         */
        'JCB' => array(
            '/^(?:2131|1800|35[0-9]{3})[0-9]{11}$/'
        ),
        /**
         * Laser cards begin with either 6304, 6706, 6709 or 6771 and have between 16 and 19 digits
         */
        'LASER' => array(
            '/^(6304|670[69]|6771)[0-9]{12,15}$/'
        ),
        /**
         * Maestro cards begin with either 5018, 5020, 5038, 5893, 6304, 6759, 6761, 6762, 6763 or 0604
         * They have between 12 and 19 digits
         */
        'MAESTRO' => array(
            '/^(5018|5020|5038|6304|6759|6761|676[23]|0604)[0-9]{8,15}$/'
        ),
        /**
         * All MasterCard numbers start with the numbers 51 through 55. All have 16 digits.
         */
        'MASTERCARD' => array(
            '/^5[1-5][0-9]{14}$/'
        ),
        /**
         * All Visa card numbers start with a 4. New cards have 16 digits. Old cards have 13.
         */
        'VISA' => array(
            '/^4([0-9]{12}|[0-9]{15})$/'
        ),
    );

    /**
     * Validates a creditcard belongs to a specified scheme.
     *
     * @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;
        }

        $schemes = array_flip((array) $constraint->schemes);
        $schemeRegexes = array_intersect_key($this->schemes, $schemes);

        foreach ($schemeRegexes as $regexes) {
            foreach ($regexes as $regex) {
                if (preg_match($regex, $value)) {
                    return;
                }
            }
        }

        $this->context->addViolation($constraint->message);
    }
}
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