Problem with PHP and MySQL

Hello guys, I have to create an order for a shopping cart, and I must recover the ID for that order, so I can use it for the order processing. My problem is that I don't know how to do this. Mind giving me a hand? I'm really stumped here.

>>7
Well, everyone has to start somewhere, don't we?

And SICP is a bit useless for what I'm doing right now.