How can shopping cart functionality be implemented in PHP?

To implement the shopping cart function, you can follow the steps below:

1. Create a shopping cart page to display the list of items in the current cart and the total amount.
2. Create a product page displaying a list of products for users to choose from, with an “Add to Cart” button next to each product.
3. When the user clicks the “Add to Cart” button, the product information will be added to the shopping cart. You can use a session to store the cart information.
4. Display the list of items and the total amount in the shopping cart page. You can retrieve and display the cart information from the session.
5. If users want to modify the quantity of items in their shopping cart, you can provide corresponding operation buttons on the shopping cart page, such as increasing quantity, decreasing quantity, deleting items, etc. It is necessary to update the shopping cart information accordingly when users perform these operations.
6. Finally, provide payment and other functions on the checkout page, submit the product information in the shopping cart to the backend for processing.

The above outlines the basic steps for implementing a simple shopping cart feature, and the specific implementation may vary depending on project requirements. Feel free to make modifications and extensions according to your own needs.