anyone know any good tutorials on creating a php based shopping cart?

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Just like the title states it, does anyone know any good tutrials/links on creating a php based shopping cart?

 

I'm currently developing a custom shopping cart system for a client of mine. So far I've got down everything from creating the database, storing the items, creating a session that holds items added to the cart, to displaying all the items in the current session, updating them and removing them.

 

What i now need some help in is on how to actually do the check out...how to insert the items currently on the session and just how to do the whole check out part.

 

So if anyone knows a good tutorial or have done this before and can help me i would gladly appreciate it

 

BTW I've looked online and i just haven't been able to find anything