How to use the flash sale function of PHP Developer City

With the development of e-commerce, competition among malls has become increasingly fierce. In order to attract users, malls generally adopt the form of flash sales activities. However, flash sale activities need to have high concurrency, high availability and other characteristics, which places high technical requirements on developers. In this article, we will introduce how to take advantage of the flash sale function of PHP Developer City.

1. The basic principle of the flash sale function

During a flash sale event, a large number of users rush to purchase the same product at the same time. If these requests cannot be processed within a short period of time, the server will easily crash. Therefore, the first problem we need to solve is how to handle high concurrency.

In order to solve the problem of high concurrency, the following methods are generally used:

1. Increase the performance of the server: This is the most basic solution, which can increase the bandwidth, storage and processing of the server Ability to improve server performance.
2. Distributed architecture: Divide a large system into several small systems. Each system is responsible for its own tasks and completes tasks collaboratively through a total system.
3. Cache: Cache frequently used data into memory to reduce the access burden on the database.

2. Steps to implement flash sale function in PHP

1. Design database table

When designing a database, there are many factors that need to be considered. How The design can quickly query and insert data, and at the same time, the lock mechanism for concurrent query and insertion needs to be considered, so that all users (buyers) can instantly get a valid flash sale token and successfully submit an order.

When we design the database, we need to consider at least the following tables:

Goods table (goods): stores basic information of goods, such as product ID, name, price, inventory, etc.

Order table (orders): stores basic information of orders, such as order ID, user ID, product ID, order status, etc.

Seckill product table (seckill_goods): stores the basic information of seckill products, such as seckill product ID, product ID, seckill price, seckill start and end time, etc.

Seckill order table (seckill_orders): stores basic information of seckill orders, such as seckill order ID, user ID, seckill product ID, order number, order status, etc.

2. Writing business logic

(1) Flash sale product list page

First, we need to display the list of all products that are on flash sale, which can be done using PHP Template engine Smarty is implemented. In Smarty, you can use some flow control statements, variables, etc. to process data.

(2) Flash sale details page

When the user clicks on a product in the flash sale product list, it will jump to the product details page. At this time, it is necessary to determine whether the product is within the flash sale time. , and return prompt information to the user.

If it is within the flash sale period, the "Second Sale Now" button needs to be displayed. Clicking this button will send an AJAX request to the flash sale interface. If the inventory of the product is not 0, the corresponding order information will be generated and returned.

(3) Flash sale interface

When the user clicks the "Second Sale Now" button, an AJAX request will be sent to the flash sale interface. In the interface, you need to perform the following operations:

1. Determine whether the user has flash sale: Query whether an order record already exists in the flash sale order table based on the user ID and product ID.
2. Determine whether the inventory of the product is sufficient: Check whether the inventory of the product is sufficient in the flash sale product table.
3. Generate order: If there is no order record and the product inventory is sufficient, a flash sale order record will be generated and the processing result will be returned.

(4) Order list page

After the flash sale is successful, users can view their order information on the order list page. When displaying order information, you need to pay attention to changes in order status.

3. Optimize program performance

In addition to the above logic implementation, program performance is also very critical. Here are several performance optimization methods.

1. Restrict user access: You can limit the number of user visits in a short period of time through IP address, user ID, cookies, etc. If the number of accesses is exceeded, an error message of "Too frequent requests" can be returned.
2. Use cache: Common data such as product information and order information can be stored in the cache server to reduce the access pressure on the database.
3. Use Redis queue: In the case of high concurrency, you can put the flash sale request in the Redis queue to release the pressure on the server through asynchronous processing and improve the processing efficiency of the program.
4. Use multi-thread processing: You can use PHP's multi-thread extension pthread to process high concurrent requests at the same time to improve the processing efficiency of the program.

In short, the technical architecture required to develop the flash sale function is relatively complex, including high concurrency, high availability, high performance and other technical requirements. However, excellent user experience and extensive market demand are still required for this technology. Provides broad development opportunities. The above are some of my thoughts and summary on using the flash sale function of PHP Developer City. I hope it can be helpful to everyone.

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