Credit Card Validation Tutorial

I was looking at the Credit Card Validation Tutorial. I tried the code and ran in to some problems. The mastercard mod 10 check passed with the card number 5555 5555 5555 1111 however when I checked Visa and AMEX cards with actual valid cards...they both failed. Thinking that it was something I missed while doing the tutorial... I used the source files from the tutorial. That code failed also. Could someone tell me what could be causing the code to fail?


Thanks

What version of PHP are you running on your server?

Also, how are you calling the validator?

Locally I am using 4.2.3

Remotely 4.2.2

I have done it myself following the tutorial and have used the tutorial source files.

both use

cctest.php which has a form that uses action="cctest.php method="post"

to submit the form information...

there is an include for

class.creditcard.php

this file has the actual validation script...