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<?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) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Ccnum.php 16223 2009-06-21 20:04:53Z thomas $
*/
/**
* @see Zend_Validate_Abstract
*/
require_once 'Zend/Validate/Abstract.php';
/**
* @category Zend
* @package Zend_Validate
* @copyright Copyright (c) 2005-2009 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%'"
);
/**
* 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;
}
}
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