User registration and ecommerce system

I have an ecommerce project to complete as an add-on to my website.

I need a user registration system enabling users to register, log in and out and have their details saved and posted to the shopping cart automatically.

When the user logs in I want them to be greeted with a welcome message and have a list of products previously purchased presented to them with links enabling them to re-purchase those items.

I need a \"User Account\" page which allows the user to edit their contact information at any time.

I do not need an actual shopping cart as I am currently using Secpay as a payment gateway provider.

I would prefer it if it was built with php as thats what I am used to.

There is no immediate rush for this as I dont need it for several weeks yet. I will be ready for it by end of December / mid January.