Credit card validator for Symfony 1.4

sfValidatorCreditcardNumber.class.php

<?php
 
/*
 
Credit Card Validator
Date - Sep 04, 2009
Author - Brent Shaffer

  Fixed bug with some of the regular expressions not matching
  (switch, jcb, enroute).
  - Phil Moorhouse <[email protected]>
 
ABOUT
This PHP script will calidate credit cards by checking there length
and pattern and checksum using mod 10.
 
Supported credit cards are VISA, MASTERCARD, DISCOVER, AMEX, DINERS,
JCB, Australian Bankcard, EnRoute And Switch Solo.

Borrows from sfValidatorCCVAL by Oriol Rius ([email protected])
*/
 
class sfValidatorCreditCardNumber extends sfValidatorBase
{
  protected $_ccregex = array(  
    "visa"        => "/^4\d{3}-?\d{4}-?\d{4}-?\d{4}$/",
    "mastercard"  => "/^5[1-5]\d{2}-?\d{4}-?\d{4}-?\d{4}$/",
    "discover"    => "/^6011-?\d{4}-?\d{4}-?\d{4}$/",
    "amex"        => "/^3[4,7]\d{13}$/",
    "diners"      => "/^3[0,6,8]\d{12}$/",
    "bankcard"    => "/^5610-?\d{4}-?\d{4}-?\d{4}$/",
    "jcb"         => "/^(3088|3096|3112|3158|3337|3528)\d{12}$/",
    "enroute"     => "/^(2014|2149)\d{11}$/",
    "switch"      => "/^(4903|4911|4936|5641|6333|6759|6334|6767)\d{12}$/"
  );
  
  public function configure($options = array(), $messages = array())
  {       
    $this->addOption('card_type', null);
    $this->addMessage('invalid', 'The credit card number you entered is not valid');
  }
  
  public function doClean($value)
  {
    if (!$this->_isValidCreditCard($value, $this->options['card_type']))
    {
      throw new sfValidatorError($this, 'invalid', array('value' => $value));
    }
    return $value;
  }
  
  /**
   * Testing checksum
   *
   * @param integer $ccnum
   * @return boolean
   */
  private function _checkSum($ccnum)
  {
    $checksum = 0;
    for ($i = (2-(strlen($ccnum) % 2)); $i <= strlen($ccnum); $i+=2)
    {
      $checksum += (int)($ccnum{$i-1});
    }
    
    // Analyze odd digits in even length strings or even digits in odd length strings.
    for ($i = (strlen($ccnum)% 2) + 1; $i < strlen($ccnum); $i+=2)
    {
      $digit = (int)($ccnum{$i-1}) * 2;
      if ($digit < 10)
      { 
        $checksum += $digit; 
      }
      else
      { 
        $checksum += ($digit-9); 
      }
    }

    return (($checksum % 10) == 0);

  }

  /**
   * Launch validation
   *
   * @param integer $ccnum
   * @param string $type
   * @param boolean $returnobj
   * @return boolean
   */
  private function _isValidCreditCard($ccnum, $type = null)
  {
    if(!$type)
    {
      $match = false;
      foreach($this->_ccregex as $type => $pattern)
      {
        if(preg_match($pattern,$ccnum) == 1)
        {
          $match = true;
          break;
        }
      }
      return $match ? $this->_checkSum($ccnum) : false;  
    }

    if(@preg_match($this->_ccregex[strtolower(trim($type))],$ccnum) == 0)
    {
      return false;  
    }
      
    return $this->_checkSum($ccnum);
  }
}