Problem validating VISA credit cards with prefix 4333...

[ACE99]

We've been using oscommerce for over 5 years, and recently we've been seeing abandoned carts because of customers not able to authorize cards with the prefix 4333...

 

In cc_validation.php we have the following lines:

 

 function validate($number, $expiry_m, $expiry_y, $cvv, $cr_card_type) {
  $this->cc_number = ereg_replace('[^0-9]', '', $number);

  if (ereg('^4[0-9]{12}([0-9]{3})?$', $this->cc_number)) {
	$this->cc_type = 'Visa';
  }
  elseif (ereg('^5[0-9][0-9]{14}$', $this->cc_number)) {
	$this->cc_type = 'Mastercard';
  }

 

From this it looks like all VISA cards with the first four numbers being either 0-9 should authorize.

 

Why are these cards being rejected?

[ACE99]

I believe we are seeing this with many cards beginning with just 43XXXXX