PHP mall development skills to implement purchase restriction function

With the rapid development of e-commerce, more and more merchants choose to open their own online malls on the Internet. In online shopping malls, product purchase quantity limit is an important function. This article will introduce the implementation techniques of the product purchase quantity limit function in PHP Developer City.

1. Database Design
   In the database, we first need to add a field to the product table to store the inventory quantity of the product. You can add a field called "stock" to the product table to store the inventory quantity of the product.
2. Modification of product details page
   On the product details page, we need to obtain the inventory quantity of the product through PHP code and display it on the front-end page. In this way, users can clearly know whether the inventory quantity of the product is sufficient when purchasing the product.
3. Modification of the shopping cart page
   On the shopping cart page, we need to judge the number of products selected by the user and determine whether the number of products selected by the user exceeds the inventory quantity of the product. If it exceeds, the user will be prompted that the product is out of stock and cannot be purchased.
4. Update of shopping cart
   When the user selects the quantity of goods to be purchased on the shopping cart page, we need to update the quantity of goods in the shopping cart in the background and re-judge whether the stock of the goods is sufficient. Ajax technology can be used to partially refresh the shopping cart page, while updating and judging product inventory in the background.
5. Modification of the order page
   On the order page, we also need to judge the quantity of the product selected by the user to determine whether the quantity of the product selected by the user exceeds the inventory quantity of the product. If it exceeds, the user will be prompted that the product is out of stock and cannot be purchased.
6. Implementation of ordering operation
   When the user selects the quantity of goods to be purchased on the ordering page, we need to place the order in the background. Before placing an order, we need to judge again whether the inventory of the product is sufficient. If the inventory is insufficient, the order cannot be placed.
7. Processing of order management
   In the order management module, we need to reduce the inventory of goods accordingly after the user places an order. That is, after generating an order, we need to update the inventory quantity of the product in the database.

Through the above implementation techniques, we can well implement the function of limiting the purchase quantity of goods. Users can clearly know the inventory quantity of each product and avoid purchasing more than the inventory quantity of the product. At the same time, we can also dynamically update the inventory quantity of products to avoid the problem of insufficient inventory caused by multiple users purchasing the same product at the same time. This can effectively improve the user experience and improve the operational efficiency of the online mall.

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