How to use PHP Developer City to implement the function of calculating the total price of selected products in the shopping cart

How to use PHP Developer City to realize the function of calculating the total price of selected goods in the shopping cart

With the continuous development of network technology, e-commerce has become one of the important ways for people to shop. To implement a complete e-commerce website, the shopping cart is one of the essential functions. The shopping cart can not only record the products selected by the user, but also manage the products in the shopping cart and calculate the total price. This article will introduce how to use PHP Developer City to implement the function of calculating the total price of selected products in the shopping cart.

1. Requirements Analysis

Before developing the shopping cart function, we need to clarify the requirements first. The functions to be implemented mainly include:

1. Users can add goods to Add to shopping cart;
2. Users can remove items from the shopping cart;
3. Users can select items in the shopping cart;
4. Calculate the price of selected items in the shopping cart in real time Total price;
5. Users can clear the shopping cart.

2. Database design

In order to store the product information in the shopping cart, we need to design the corresponding database table. The commonly used shopping cart table structure is as follows:

Shopping cart table (cart):
Field name type description
cart_id INT Shopping cart ID
user_id INT User ID
product_id INT Product ID
quantity INT Product quantity
selected TINYINT Whether to select

Product table (product):
Field name type description
product_id INT Product ID
name VARCHAR Product name
price DECIMAL(10, 2) Product price

User table (user):
Field name type description
user_id INT User ID
username VARCHAR User name

Shopping cart The table is related to the product table through the product ID, and the shopping cart table is related to the user table through the user ID.

3. Code Implementation

In terms of code implementation, we can use PHP language for development. The main implementation process is as follows:

1. First, after the user logs in, the user ID is saved in the session to facilitate subsequent data processing.
2. When the user adds a product to the shopping cart, he clicks the "Add to Shopping Cart" button to send a request to the backend, insert the product information into the shopping cart table, and add the user ID, product ID, quantity and selected status. Write to database. At the same time, the shopping cart icon on the page displays the number of items in the shopping cart.
3. When the user can remove a product from the shopping cart, click the "Remove from Shopping Cart" button to send a request to the backend to delete the corresponding product information in the database.
4. When users select items in the shopping cart, they can update the selected status of the item to the database by clicking on the check box in front of the item.
5. On the shopping cart page, by querying the data of the shopping cart table in the database, the selected products are displayed on the page, and the total price of the products is calculated and displayed in real time.
6. On the shopping cart page, the user can clear the shopping cart by clicking the "Clear Shopping Cart" button to send a request to the background to delete all the data in the shopping cart table.

4. Front-end and back-end interaction

In order to achieve front-end and back-end interaction, Ajax technology can be used. When the user operates, the data is sent to the background for processing through asynchronous requests, and corresponding judgment and processing are made based on the return results from the background.

For example, when the user selects a product, you can use the following code to implement:

$("input[type='checkbox']").click(function() {
    var productId = $(this).val();
    var selected = $(this).prop("checked") ? 1 : 0;
    $.ajax({
        url: "update_select.php",
        method: "POST",
        data: {
            productId: productId,
            selected: selected
        },
        success: function(response) {
            // 根据后台返回的结果进行相应的处理
        }
    });
});

When receiving and processing requests in the background, you can use the following code to implement:

$productId = $_POST["productId"];
$selected = $_POST["selected"];

// 根据商品ID更新购物车表中商品的选中状态

// 返回处理结果
echo json_encode(["success" => true]);

五, Security considerations

When developing the shopping cart function, in order to protect the security of users’ personal information and shopping records, you need to pay attention to the following points:

1. When users log in and submit data , perform necessary verification and filtering on user input to prevent malicious users from exploiting security vulnerabilities to attack.
2. When interacting with the database, use prepared statements and bound parameters to prevent SQL injection attacks.
3. After the user logs in, save the user's login status and related information by using session.
4. Destroy the session promptly when the user logs out or closes the web page.

6. Summary

The shopping cart is one of the important functions in an e-commerce website. To realize the function of calculating the total price of selected products in the shopping cart requires demand analysis, database design, and code implementation. As well as front-end and back-end interaction and other steps. During the development process, attention needs to be paid to protecting the security of user information. Through reasonable design and development, a shopping cart function with complete functions and good user experience can be realized.

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