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   1  <?php
   2  /**
   3   * Zend Framework
   4   *
   5   * LICENSE
   6   *
   7   * This source file is subject to the new BSD license that is bundled
   8   * with this package in the file LICENSE.txt.
   9   * It is also available through the world-wide-web at this URL:
  10   * http://framework.zend.com/license/new-bsd
  11   * If you did not receive a copy of the license and are unable to
  12   * obtain it through the world-wide-web, please send an email
  13   * to [email protected] so we can send you a copy immediately.
  14   *
  15   * @category   Zend
  16   * @package    Zend_Validate
  17   * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  18   * @license    http://framework.zend.com/license/new-bsd     New BSD License
  19   * @version    $Id$
  20   */
  21  
  22  /**
  23   * @see Zend_Validate_Abstract
  24   */
  25  require_once 'Zend/Validate/Abstract.php';
  26  
  27  /**
  28   * @category   Zend
  29   * @package    Zend_Validate
  30   * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  31   * @license    http://framework.zend.com/license/new-bsd     New BSD License
  32   */
  33  class Zend_Validate_Ccnum extends Zend_Validate_Abstract
  34  {
  35      /**
  36       * Validation failure message key for when the value is not of valid length
  37       */
  38      const LENGTH   = 'ccnumLength';
  39  
  40      /**
  41       * Validation failure message key for when the value fails the mod-10 checksum
  42       */
  43      const CHECKSUM = 'ccnumChecksum';
  44  
  45      /**
  46       * Digits filter for input
  47       *
  48       * @var Zend_Filter_Digits
  49       */
  50      protected static $_filter = null;
  51  
  52      /**
  53       * Validation failure message template definitions
  54       *
  55       * @var array
  56       */
  57      protected $_messageTemplates = array(
  58          self::LENGTH   => "'%value%' must contain between 13 and 19 digits",
  59          self::CHECKSUM => "Luhn algorithm (mod-10 checksum) failed on '%value%'"
  60      );
  61  
  62      public function __construct()
  63      {
  64          trigger_error('Using the Ccnum validator is deprecated in favor of the CreditCard validator');
  65      }
  66  
  67      /**
  68       * Defined by Zend_Validate_Interface
  69       *
  70       * Returns true if and only if $value follows the Luhn algorithm (mod-10 checksum)
  71       *
  72       * @param  string $value
  73       * @return boolean
  74       */
  75      public function isValid($value)
  76      {
  77          $this->_setValue($value);
  78  
  79          if (null === self::$_filter) {
  80              /**
  81               * @see Zend_Filter_Digits
  82               */
  83              require_once 'Zend/Filter/Digits.php';
  84              self::$_filter = new Zend_Filter_Digits();
  85          }
  86  
  87          $valueFiltered = self::$_filter->filter($value);
  88  
  89          $length = strlen($valueFiltered);
  90  
  91          if ($length < 13 || $length > 19) {
  92              $this->_error(self::LENGTH);
  93              return false;
  94          }
  95  
  96          $sum    = 0;
  97          $weight = 2;
  98  
  99          for ($i = $length - 2; $i >= 0; $i--) {
 100              $digit = $weight * $valueFiltered[$i];
 101              $sum += floor($digit / 10) + $digit % 10;
 102              $weight = $weight % 2 + 1;
 103          }
 104  
 105          if ((10 - $sum % 10) % 10 != $valueFiltered[$length - 1]) {
 106              $this->_error(self::CHECKSUM, $valueFiltered);
 107              return false;
 108          }
 109  
 110          return true;
 111      }
 112  }