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112 lines
2.9 KiB
PHP
112 lines
2.9 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Validate
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Ccnum.php 8064 2008-02-16 10:58:39Z thomas $
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*/
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/**
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* @see Zend_Validate_Abstract
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*/
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require_once 'Zend/Validate/Abstract.php';
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/**
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* @category Zend
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* @package Zend_Validate
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Validate_Ccnum extends Zend_Validate_Abstract
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{
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/**
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* Validation failure message key for when the value is not of valid length
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*/
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const LENGTH = 'ccnumLength';
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/**
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* Validation failure message key for when the value fails the mod-10 checksum
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*/
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const CHECKSUM = 'ccnumChecksum';
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/**
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* Digits filter for input
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*
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* @var Zend_Filter_Digits
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*/
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protected static $_filter = null;
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/**
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* Validation failure message template definitions
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*
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* @var array
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*/
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protected $_messageTemplates = array(
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self::LENGTH => "'%value%' must contain between 13 and 19 digits",
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self::CHECKSUM => "Luhn algorithm (mod-10 checksum) failed on '%value%'"
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);
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/**
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* Defined by Zend_Validate_Interface
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*
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* Returns true if and only if $value follows the Luhn algorithm (mod-10 checksum)
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*
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* @param string $value
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* @return boolean
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*/
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public function isValid($value)
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{
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$this->_setValue($value);
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if (null === self::$_filter) {
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/**
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* @see Zend_Filter_Digits
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*/
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require_once 'Zend/Filter/Digits.php';
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self::$_filter = new Zend_Filter_Digits();
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}
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$valueFiltered = self::$_filter->filter($value);
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$length = strlen($valueFiltered);
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if ($length < 13 || $length > 19) {
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$this->_error(self::LENGTH);
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return false;
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}
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$sum = 0;
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$weight = 2;
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for ($i = $length - 2; $i >= 0; $i--) {
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$digit = $weight * $valueFiltered[$i];
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$sum += floor($digit / 10) + $digit % 10;
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$weight = $weight % 2 + 1;
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}
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if ((10 - $sum % 10) % 10 != $valueFiltered[$length - 1]) {
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$this->_error(self::CHECKSUM, $valueFiltered);
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return false;
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}
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return true;
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}
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}
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