<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Validate

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Ccnum.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/**

 * @see Zend_Validate_Abstract

 */

require_once 'Zend/Validate/Abstract.php';

/**

 * @category   Zend

 * @package    Zend_Validate

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Validate_Ccnum extends Zend_Validate_Abstract

{

    /**

     * Validation failure message key for when the value is not of valid length

     */

    const LENGTH   = 'ccnumLength';

    /**

     * Validation failure message key for when the value fails the mod-10 checksum

     */

    const CHECKSUM = 'ccnumChecksum';

    /**

     * Digits filter for input

     *

     * @var Zend_Filter_Digits

     */

    protected static $_filter = null;

    /**

     * Validation failure message template definitions

     *

     * @var array

     */

    protected $_messageTemplates = array(

        self::LENGTH   => "'%value%' must contain between 13 and 19 digits",

        self::CHECKSUM => "Luhn algorithm (mod-10 checksum) failed on '%value%'"

    );

    public function __construct()

    {

        trigger_error('Using the Ccnum validator is deprecated in favor of the CreditCard validator');

    }

    /**

     * Defined by Zend_Validate_Interface

     *

     * Returns true if and only if $value follows the Luhn algorithm (mod-10 checksum)

     *

     * @param  string $value

     * @return boolean

     */

    public function isValid($value)

    {

        $this->_setValue($value);

        if (null === self::$_filter) {

            /**

             * @see Zend_Filter_Digits

             */

            require_once 'Zend/Filter/Digits.php';

            self::$_filter = new Zend_Filter_Digits();

        }

        $valueFiltered = self::$_filter->filter($value);

        $length = strlen($valueFiltered);

        if ($length < 13 || $length > 19) {

            $this->_error(self::LENGTH);

            return false;

        }

        $sum    = 0;

        $weight = 2;

        for ($i = $length - 2; $i >= 0; $i--) {

            $digit = $weight * $valueFiltered[$i];

            $sum += floor($digit / 10) + $digit % 10;

            $weight = $weight % 2 + 1;

        }

        if ((10 - $sum % 10) % 10 != $valueFiltered[$length - 1]) {

            $this->_error(self::CHECKSUM, $valueFiltered);

            return false;

        }

        return true;

    }

}