checkout process - remembering data from previous page

[zander1983]

Hi

Im developing a marketplace style site. There are 3 steps for the person to go through before confirming a purchase i.e. postage, shipping details and payment details pages. What is the best way for remembering a users data as they go through the process? At the moment, I do something like this for the postage page:

 

$_SESSION['Post']['PostTypeID']  = $postType

$_SESSION['Post']['TotalPrice']  = $totalPrice

 

I use more session values for the other pages. Is this the best method? The session variable can get quite large.... Also, a few years ago when i was doing .net, we would create a Class at the start of the checkout process, and then pass the class through and set the different attributes e.g. shippingAddress1, totalPrice etc. Is it possible to do something like this in php?