How to use PHP to implement the secondary purchase system of the mall

With the continuous development of e-commerce, more and more retail companies are turning to online sales. However, e-commerce also brings new problems: how to retain old customers? How to increase the frequency of repeat sales? This is why it is necessary to implement a secondary purchase system for the mall. In this article, we will introduce how to use PHP to implement the secondary purchase system of the mall.

1. Establishing the basic data structure
Establishing the basic data structure is crucial to the implementation of the secondary purchase system. We need to create a database table to store customer order and product information. The fields of the table should include the following information: order ID, product ID, product name, purchase date, customer ID, purchase quantity, and total price. We can use MySQL or other relational databases to create this table.

2. Create a PHP page
Next, we need to create a page on the web page that can be used by users. We can add a link on the homepage of the mall or in the customer account, and users can enter the secondary purchase system after clicking it. Use PHP language to write this page, and the front end uses HTML and CSS.

3. Query order history through SQL statements
In this page, we need to display the customer's order history. Use SQL statements to query the order history corresponding to the customer ID. First, get the customer ID, then create a SQL query statement, use INNER JOIN to connect the order table and product table, and sort them in descending order by purchase date to display the most recent order records.

4. List related products
List the products that customers have purchased on the page, so that users can easily find the products they recently purchased and then make a secondary purchase. Use SQL statements to query the products purchased in the customer's historical orders and display the product name and price.

5. Provide the option of secondary purchase
After listing the product, provide the option of secondary purchase. This can be achieved by adding to the shopping cart, or using PDO to implement adding to the shopping cart. In this process, we need to insert a new order record into the database, update the order quantity and total price, and then the user can continue shopping.

6. Provide coupons
Finally, we can use coupons to encourage customers to make secondary purchases. Add a coupon section to the secondary purchase system page. Users can enter the coupon code on the page, and then the system will verify whether the coupon code is valid. If valid, the total price of the current purchase will be reduced.

To sum up, by using PHP language to implement the secondary purchase system of the mall, we can help merchants retain old customers and increase the frequency of repeat sales. Establishing a basic data structure, creating a PHP page, querying order history through SQL statements, listing related products, providing secondary purchase options and providing coupons are all crucial to implementing a successful secondary purchase system.

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