Credit card validation in codeigniter

Rakesh Sharma      No Comments  

Credit card validation in codeigniter :-

I found a good code for credit card validation in php. and working with codeigniter so i need to use this code in codeigniter so i make a credit card validation helper in codeigniter and easily use this.
This is good and easy integration credit card validation code i found. you can also use this by making a library in codeigniter but i am sharing what i have to use this in codeigniter.

Using helper :-

A. Create a helper with named credit_card_helper.php under “application/helpers/credit_card_helper.php” and add below code :-

function checkCreditCard ($cardnumber, $cardname, &$errornumber, &$errortext) {
  // Define the cards we support. You may add additional card types.
  //  Name:      As in the selection box of the form - must be same as user's
  //  Length:    List of possible valid lengths of the card number for the card
  //  prefixes:  List of possible prefixes for the card
  //  checkdigit Boolean to say whether there is a check digit
  
  $cards = array (  array ('name' => 'American Express', 
                          'length' => '15', 
                          'prefixes' => '34,37',
                          'checkdigit' => true
                         ),
                   array ('name' => 'Diners Club Carte Blanche', 
                          'length' => '14', 
                          'prefixes' => '300,301,302,303,304,305',
                          'checkdigit' => true
                         ),
                   array ('name' => 'Diners Club', 
                          'length' => '14,16',
                          'prefixes' => '36,38,54,55',
                          'checkdigit' => true
                         ),
                   array ('name' => 'Discover', 
                          'length' => '16', 
                          'prefixes' => '6011,622,64,65',
                          'checkdigit' => true
                         ),
                   array ('name' => 'Diners Club Enroute', 
                          'length' => '15', 
                          'prefixes' => '2014,2149',
                          'checkdigit' => true
                         ),
                   array ('name' => 'JCB', 
                          'length' => '16', 
                          'prefixes' => '35',
                          'checkdigit' => true
                         ),
                   array ('name' => 'Maestro', 
                          'length' => '12,13,14,15,16,18,19', 
                          'prefixes' => '5018,5020,5038,6304,6759,6761,6762,6763',
                          'checkdigit' => true
                         ),
                   array ('name' => 'MasterCard', 
                          'length' => '16', 
                          'prefixes' => '51,52,53,54,55',
                          'checkdigit' => true
                         ),
                   array ('name' => 'Solo', 
                          'length' => '16,18,19', 
                          'prefixes' => '6334,6767',
                          'checkdigit' => true
                         ),
                   array ('name' => 'Switch', 
                          'length' => '16,18,19', 
                          'prefixes' => '4903,4905,4911,4936,564182,633110,6333,6759',
                          'checkdigit' => true
                         ),
                   array ('name' => 'Visa', 
                          'length' => '16', 
                          'prefixes' => '4',
                          'checkdigit' => true
                         ),
                   array ('name' => 'VISA Electron', 
                          'length' => '16', 
                          'prefixes' => '417500,4917,4913,4508,4844',
                          'checkdigit' => true
                         ),
                   array ('name' => 'LaserCard', 
                          'length' => '16,17,18,19', 
                          'prefixes' => '6304,6706,6771,6709',
                          'checkdigit' => true
                         )
                );

  $ccErrorNo = 0;

  $ccErrors [0] = "Unknown card type";
  $ccErrors [1] = "No card number provided";
  $ccErrors [2] = "Credit card number has invalid format";
  $ccErrors [3] = "Credit card number is invalid";
  $ccErrors [4] = "Credit card number is wrong length";
               
  // Establish card type
  $cardType = -1;
  for ($i=0; $i<sizeof($cards); $i++) {

    // See if it is this card (ignoring the case of the string)
    if (strtolower($cardname) == strtolower($cards[$i]['name'])) {
      $cardType = $i;
      break;
    }
  }
  
  // If card type not found, report an error
  if ($cardType == -1) {
     $errornumber = 0;     
     $errortext = $ccErrors [$errornumber];
     return false; 
  }
   
  // Ensure that the user has provided a credit card number
  if (strlen($cardnumber) == 0)  {
     $errornumber = 1;     
     $errortext = $ccErrors [$errornumber];
     return false; 
  }
  
  // Remove any spaces from the credit card number
  $cardNo = str_replace (' ', '', $cardnumber);  
   
  // Check that the number is numeric and of the right sort of length.
  if (!preg_match("/^[0-9]{13,19}$/",$cardNo))  {
     $errornumber = 2;     
     $errortext = $ccErrors [$errornumber];
     return false; 
  }
       
  // Now check the modulus 10 check digit - if required
  if ($cards[$cardType]['checkdigit']) {
    $checksum = 0;                                  // running checksum total
    $mychar = "";                                   // next char to process
    $j = 1;                                         // takes value of 1 or 2
  
    // Process each digit one by one starting at the right
    for ($i = strlen($cardNo) - 1; $i >= 0; $i--) {
    
      // Extract the next digit and multiply by 1 or 2 on alternative digits.      
      $calc = $cardNo{$i} * $j;
    
      // If the result is in two digits add 1 to the checksum total
      if ($calc > 9) {
        $checksum = $checksum + 1;
        $calc = $calc - 10;
      }
    
      // Add the units element to the checksum total
      $checksum = $checksum + $calc;
    
      // Switch the value of j
      if ($j ==1) {$j = 2;} else {$j = 1;};
    } 
  
    // All done - if checksum is divisible by 10, it is a valid modulus 10.
    // If not, report an error.
    if ($checksum % 10 != 0) {
     $errornumber = 3;     
     $errortext = $ccErrors [$errornumber];
     return false; 
    }
  }  

  // The following are the card-specific checks we undertake.

  // Load an array with the valid prefixes for this card
  $prefix = explode(',',$cards[$cardType]['prefixes']);
      
  // Now see if any of them match what we have in the card number  
  $PrefixValid = false; 
  for ($i=0; $i<sizeof($prefix); $i++) {
    $exp = '/^' . $prefix[$i] . '/';
    if (preg_match($exp,$cardNo)) {
      $PrefixValid = true;
      break;
    }
  }
      
  // If it isn't a valid prefix there's no point at looking at the length
  if (!$PrefixValid) {
     $errornumber = 3;     
     $errortext = $ccErrors [$errornumber];
     return false; 
  }
    
  // See if the length is valid for this card
  $LengthValid = false;
  $lengths = explode(',',$cards[$cardType]['length']);
  for ($j=0; $j<sizeof($lengths); $j++) {
    if (strlen($cardNo) == $lengths[$j]) {
      $LengthValid = true;
      break;
    }
  }
  
  // See if all is OK by seeing if the length was valid. 
  if (!$LengthValid) {
     $errornumber = 4;     
     $errortext = $ccErrors [$errornumber];
     return false; 
  };   
  
  // The credit card is in the required format.
  return true;
}

B. Add below code in your controller :- Making a callback function to call on validation time.

function cardnumber_validation($string = NULL) {
  $this->load->helper('credit_card'); // loading helper.
  if (checkCreditCard ($string, $cardtype, $ccerror, $ccerrortext)) {
    return TRUE;
  } 
  else {
    $this->form_validation->set_message("cardnumber_validation", 'The %s is not valid.');
    return FALSE;
  }
}

C. Call above function in validation rules:-

$this->form_validation->set_rules('cardnumber', 'Card Number', 'trim|required|xss_clean|callback_cardnumber_validation');


Now you are all set with credit card number validation or credit card validation in codeigniter. you can also use above function in your library to make credit card validation library in codeigniter.