Ccnum.php
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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) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Ccnum.php 3278 2007-02-07 21:54:50Z darby $
*/
/**
* @see Zend_Validate_Interface
*/
require_once 'Zend/Validate/Interface.php';
/**
* @see Zend_Filter_Digits
*/
require_once 'Zend/Filter/Digits.php';
/**
* @category Zend
* @package Zend_Validate
* @copyright Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Validate_Ccnum implements Zend_Validate_Interface
{
/**
* Array of validation failure messages
*
* @var array
*/
protected $_messages = array();
/**
* 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->_messages = array();
$filterDigits = new Zend_Filter_Digits();
$valueFiltered = $filterDigits->filter($value);
$length = strlen($valueFiltered);
if ($length < 13 || $length > 19) {
$this->_messages[] = "'$value' must contain between 13 and 19 digits";
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]) {
$this->_messages[] = "Luhn algorithm (mod-10 checksum) failed on '$valueFiltered'";
return false;
}
return true;
}
/**
* Defined by Zend_Validate_Interface
*
* Returns array of validation failure messages
*
* @return array
*/
public function getMessages()
{
return $this->_messages;
}
}