How to use PHP to synchronize the number of user products in the shopping cart?

How to use PHP Developer City to synchronize the number of users' shopping carts

With the rapid development of e-commerce, more and more companies choose to build their own e-malls for online sales. As one of the indispensable functions in e-malls, the shopping cart is of extremely high importance to users. When developing a mall website, how to synchronize the number of users' shopping carts has become a difficult problem that needs to be solved. This article will introduce how to use PHP to develop a mall website and implement the user shopping cart quantity synchronization function.

1. Design database
   Before building the mall website, you first need to design the database. The database of the mall website mainly includes user information table, product information table and shopping cart table. Among them, the shopping cart table needs to contain fields such as product ID, user ID, and purchase quantity.
2. Create PHP files
   Create corresponding PHP files according to the needs of the mall website, including functions such as user login, product display, and shopping cart management. These PHP files need to connect to the database and use SQL statements to read and modify data.
3. User login function
   The prerequisite for realizing the user shopping cart quantity synchronization function is that the user logs in. When a user logs in, it is necessary to verify whether the user's username and password are correct. If the verification passes, the user information is stored in the session.
4. Product display function
   The mall website needs to display various products, and users can browse the products and choose to add to the shopping cart. When displaying products, product information needs to be read from the database and displayed on the web page in a certain format.
5. Shopping cart function
   When the user adds items to the shopping cart, the corresponding PHP file is triggered by clicking the shopping cart button to implement the shopping cart function. In the PHP file, it is necessary to determine whether the user is logged in. If the user is logged in, the product ID, user ID and purchase quantity are inserted into the shopping cart table; if the user is not logged in, the product information is stored in cookies.
6. Shopping cart quantity synchronization function
   The key to realizing the shopping cart quantity synchronization function is to synchronize the shopping cart information stored in cookies to the database after the user logs in. After the user logs in, the product information in the cookies is read and inserted into the shopping cart table. At the same time, the user's shopping cart information needs to be cleared before logging in.
7. Shopping cart display function
   After the user logs in, the user can view the product information in the shopping cart. By reading the shopping cart information of the corresponding user ID in the shopping cart table, the products in the shopping cart are displayed on the web page.
8. Modify shopping cart function
   Users can modify the number of items in the shopping cart or delete items. When modifying the shopping cart, you need to modify the purchase quantity fields of the corresponding product ID and user ID in the shopping cart table, or delete the corresponding product information from the shopping cart table.

Through the above steps and using the PHP Developer City website, we can successfully implement the user shopping cart quantity synchronization function. After the user logs in, both the products that have been added to the shopping cart in the early stage and the products added after logging in can be synchronized to the shopping cart. In this way, the user will not lose the items in the shopping cart due to whether he or she is logged in during the shopping process, which enhances the user's shopping experience. At the same time, the mall website can also more accurately count users' purchasing behavior, providing a reference for the company's sales decisions.

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