What is the best way to validate a credit card in codeigniter - php

Question

hi i am using codeigniter . i want to validate my credit card details . i saw there are classes in php to validate credit card numbers . i saw a helper in codeigniter to validate credit cards
http://codeigniter.com/wiki/Credit_Card_Helper
/**
* Truncates a card number retaining only the first 4 and the last 4 digits. It then returns the truncated form.
*
* #param string The card number to truncate.
* #return string The truncated card number.
*/
function truncate_card($card_num) {
$padsize = (strlen($card_num) < 7 ? 0 : strlen($card_num) - 7);
return substr($card_num, 0, 4) . str_repeat('X', $padsize). substr($card_num, -3);
}
/**
* Validates a card expiry date. Finds the midnight on first day of the following
* month and ensures that is greater than the current time (cards expire at the
* end of the printed month). Assumes basic sanity checks have already been performed
* on month/year (i.e. length, numeric, etc).
*
* #param integer The expiry month shown on the card.
* #param integer The expiry year printed on the card.
* #return boolean Returns true if the card is still valid, false if it has expired.
*/
function card_expiry_valid($month, $year) {
$expiry_date = mktime(0, 0, 0, ($month + 1), 1, $year);
return ($expiry_date > time());
}
/**
* Strips all non-numerics from the card number.
*
* #param string The card number to clean up.
* #return string The stripped down card number.
*/
function card_number_clean($number) {
return ereg_replace("[^0-9]", "", $number);
}
/**
* Uses the Luhn algorithm (aka Mod10) <http://en.wikipedia.org/wiki/Luhn_algorithm>
* to perform basic validation of a credit card number.
*
* #param string The card number to validate.
* #return boolean True if valid according to the Luhn algorith, false otherwise.
*/
function card_number_valid ($card_number) {
$card_number = strrev(card_number_clean($card_number));
$sum = 0;
for ($i = 0; $i < strlen($card_number); $i++) {
$digit = substr($card_number, $i, 1);
// Double every second digit
if ($i % 2 == 1) {
$digit *= 2;
}
// Add digits of 2-digit numbers together
if ($digit > 9) {
$digit = ($digit % 10) + floor($digit / 10);
}
$sum += $digit;
}
// If the total has no remainder it's OK
return ($sum % 10 == 0);
}
?>
it uses a common validation . but i want a validation according to card type like this
http://www.braemoor.co.uk/software/creditcard.php
is there any libraries or helpers in codeigniter . please help.....................

Answer 1

As people already told you, CodeIgniter is a php framework, coded using php, works in a php environment and makes use of..,php classes and functions :).
What's more, the file you linked to is a simple function. One function. You know what you can do? Take the file as it is, name it creditcard_helper.php, put it inside the helpers folder, open it and place the whole code inside this snippet (ugly but necessary, as whenever you'll load the helper a second time it would give you error otherwise):
if(!function_exists('checkCreditCard')
{
//the whole content goes here untouched;
}
And you're set. Just use:
$this->load->helper('creditcard');
if(checkCreditCard($cardnumber, $cardname, &$errornumber, &$errortext))
{
echo 'card OK';
}
else
{
echo 'wrong card type/number';
}

Answer 2

I found this helper inside the CodeIgniter Github wiki page. When dropped inside your helpers folder, you can then use the functions from the file in a controller or model you load it in.