/**
* Validates a credit card number, with a Luhn check if possible.
*
* @param integer $number credit card number
* @param string|array $type card type, or an array of card types
* @return boolean
* @uses Valid::luhn
*/
public static function credit_card($number, $type = NULL)
{
// Remove all non-digit characters from the number
if (($number = preg_replace('/\\D+/', '', $number)) === '') {
return FALSE;
}
if ($type == NULL) {
// Use the default type
$type = 'default';
} elseif (is_array($type)) {
foreach ($type as $t) {
// Test each type for validity
if (Valid::credit_card($number, $t)) {
return TRUE;
}
}
return FALSE;
}
$cards = Kohana::$config->load('credit_cards');
// Check card type
$type = strtolower($type);
if (!isset($cards[$type])) {
return FALSE;
}
// Check card number length
$length = strlen($number);
// Validate the card length by the card type
if (!in_array($length, preg_split('/\\D+/', $cards[$type]['length']))) {
return FALSE;
}
// Check card number prefix
if (!preg_match('/^' . $cards[$type]['prefix'] . '/', $number)) {
return FALSE;
}
// No Luhn check required
if ($cards[$type]['luhn'] == FALSE) {
return TRUE;
}
return Valid::luhn($number);
}
