Developer.com: Developing a Ajax-driven Shopping Cart with PHP and Prototype

"In recent weeks I've been working on an e-commerce project. Among the project goals included building an Ajax-driven shopping cart which is intended to further enhance the user's shopping experience. In the latest installment of this ongoing PHP series, I'll show you how to build a shopping cart using PHP, session handling, and the Prototype JavaScript library (introduced in an earlier installment). The cart allows users to add and delete products from the cart, as well as change cart quantities. And of course, the interaction is seemingly instantaneous, allowing for the user to continue shopping without waiting for the page to reload..."

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