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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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Validate_Abstract
  */
 // require_once 'Zend/Validate/Abstract.php';
 
 /**
  * @category   Zend
  * @package    Zend_Validate
  * @copyright  Copyright (c) 2005-2015 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;
     }
 }