Payment processing is a major thing that has huge legal and security concerns. You can't run a PayPal-like system with a pre-made script. You can code a shopping cart, but the actual payment processing requires a merchant account that connects to the major credit cards.

Plus, a Poker program that's multiplayer would probably need some kind of client-side technology, such as Flash or Ajax to be up to date. PHP by itself would be too slow and require constant reloading.

(Sorry this post isn't really... encouraging.)

Thank you for your response. If you can give me an idea of where to start for both it would be greatly appreciated.

you can get the webost where you get free mearchant account, shopping cart.