How to implement a customized shopping cart in WeChat applet with PHP

As the number of mobile users continues to increase, WeChat mini programs have become the preferred platform for many merchants. In mini programs, customized shopping carts are a very important function, which can meet users' various shopping needs, increase user experience, and increase sales. This article will introduce how to use PHP to implement the customized shopping cart function in the WeChat applet.

1. Development Environment of WeChat Mini Program

Before we start to introduce how to implement a customized shopping cart, we need to understand some basic knowledge of WeChat Mini Program.

1. Development tools for WeChat mini programs

The development tools for WeChat mini programs need to be downloaded and installed. They support Windows, Mac and Linux. You can download the latest version from the official website. Development tools provide developers with a visual development environment that supports code editing, debugging, and publishing functions.

2. Development language of WeChat applet

Currently, WeChat applet supports two development languages: JavaScript and WXML. Among them, JavaScript is used to implement the logic in the mini program, and WXML is used to implement the interface layout and style of the mini program.

3. API of WeChat Mini Program

The API of WeChat Mini Program can be divided into four categories: network API, interface API, media API and data API. Among them, the network API is mainly used for the interaction between the mini program and the server, including network requests, WebSocket, etc.; the interface API is used to implement various interface elements in the mini program, including views, navigation bars, pop-up windows, etc.; the media API can realize taking pictures , recording, audio playback and other functions; the data API is used to implement local data storage in mini programs, including data caching, file storage, etc.

2. PHP implements the WeChat mini program shopping cart function

1. Login and authentication

First, the user needs to log in in the mini program to obtain the user's openid and session_key. The user's openid and session_key are the user ID and session key, which are required for communication between the applet and the server. After successful login, we can store the user's openid and session_key in the server-side database for subsequent use.

In addition to logging in, users also need to be authenticated. Before operating the shopping cart, the user's identity needs to be verified to ensure that the user has the authority to operate the shopping cart. This can be verified through openid and session_key. If authentication fails, the user needs to log in again.

2. Product display and adding to shopping cart

In the mini program, products need to be displayed on the front-end page, usually in the form of a list or carousel. Users can add products to the shopping cart by clicking on the product or adding to the shopping cart button. The operation of adding to the shopping cart includes the quantity and specifications of the product, and the product information needs to be transferred to the back-end server for processing.

In the back-end server, the product information added to the shopping cart needs to be stored in the database and associated based on the user's openid. Each shopping cart record includes product ID, name, price, quantity, specifications and other information. When storing the shopping cart record, it is necessary to determine whether the product already exists in the user's shopping cart. If it exists, then add 1 to the quantity of the corresponding product in the shopping cart. If it does not exist, you need to create a new shopping cart record and save it to the shopping cart table.

3. Shopping cart list and editing

On the shopping cart page, it is necessary to display the list of products that the user has added to the shopping cart. The shopping cart list includes the name, price, quantity, specifications and other information of the products, and the products in it can be edited, deleted and other operations.

In the shopping cart list, editing operations can include modifying product quantity, modifying product specifications, deleting products, etc. When modifying product quantity or product specifications, the price of the product needs to be recalculated. When the user clicks the delete button, the corresponding product record in the shopping cart needs to be deleted from the shopping cart table.

When performing an editing operation, the modified shopping cart record needs to be synchronized to the shopping cart table. When a user deletes a shopping cart, the deleted shopping cart record also needs to be deleted from the shopping cart table simultaneously.

4. Shopping cart settlement and order generation

After completing the shopping cart operation, the user needs to perform settlement operations and generate orders. During the settlement operation, all product information in the shopping cart needs to be transferred to the back-end server for settlement calculation. After the calculation is completed, a new order record needs to be generated and the order information stored in the order table. Order information includes order number, order time, product information, total amount, etc.

After the order is generated, the order information needs to be returned to the front-end page for users to view and pay. After completing the order payment, you need to update the status of the order and issue shipping notifications and other operations as needed.

3. Summary

This article mainly introduces how to use PHP to implement the shopping cart function in the WeChat applet. The shopping cart function is a very important function in the mini program and is of great value to both merchants and users. Through the introduction of this article, we can understand the implementation principle of the shopping cart function, including operations such as login authentication, product display and adding to the shopping cart, shopping cart list and editing, shopping cart settlement and order generation. I believe that after studying this article, readers can better understand and master how to implement customized shopping cart functions in WeChat mini programs.

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