PHP e-commerce system development guide shopping cart design

Shopping cart design: Database design: Stores user ID, product ID, quantity and session ID. PHP code: Provides functionality to operate the shopping cart, including adding, updating, and deleting products. Practical case: Use addToCart(), updateCartQuantity(), getCartProducts() and removeFromCart() functions to implement the shopping cart function. Best practices: Use session or user ID to track shopping carts, real-time update quantities, allowed modification quantities, and anonymous actions.

PHP E-commerce System Development Guide: Shopping Cart Design

Introduction

The shopping cart is a vital part of the e-commerce system, which allows users to select and reserve the products they intend to purchase. Designing an efficient and user-friendly shopping cart is crucial to improving user experience and shopping volume.

Database Design

Shopping cart information can be stored in the database, usually including the following fields:

CREATE TABLE cart (
  id INT NOT NULL AUTO_INCREMENT,
  user_id INT NOT NULL,
  product_id INT NOT NULL,
  quantity INT NOT NULL DEFAULT 1,
  session_id VARCHAR(255) NOT NULL,
  PRIMARY KEY (id)
);

• id: Primary key.
• user_id: User ID (if logged in).
• product_id: Product ID.
• quantity: Product quantity.
• session_id: Used to save the shopping cart information of non-logged in users.

PHP code

The following code snippet demonstrates how to use PHP to operate a shopping cart:

// 获取购物车产品
$cartProducts = getCartProducts();

// 添加产品到购物车
addToCart($product_id, $quantity);

// 更新购物车中商品的数量
updateCartQuantity($product_id, $quantity);

// 从购物车中删除产品
removeFromCart($product_id);

Practical case

Suppose we have a website that allows users to browse and purchase items. The following are the steps on how to implement the shopping cart function:

1. When the user adds items to the shopping cart, execute the addToCart() function to add product information to the of the database cart table.
2. When the user updates the quantity of items in the shopping cart, execute the updateCartQuantity() function to update the quantity of the corresponding product in the cart table.
3. When the user views the shopping cart, execute the getCartProducts() function to retrieve all products contained in the shopping cart from the database.
4. When the user removes an item from the shopping cart, execute the removeFromCart() function to delete the product from the cart table in the database.

Best Practices

• Use a session or user ID to track shopping cart information.
• Update the quantity of products in the shopping cart in real time.
• Provide users with the option to modify the quantity of products in the shopping cart.
• Allow users to perform operations without logging in.

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