How to use PHP Developer Mall shopping cart to calculate the total price?

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

With the rapid development of e-commerce, more and more merchants choose to sell goods through online malls. In a complete shopping mall system, the shopping cart is a very important function, which allows users to easily browse and manage the products they choose. The total price calculation function of the shopping cart is even more indispensable. It can help users clearly understand the total price of the items in the shopping cart and conduct further settlement and payment. This article will introduce how to use PHP Developer City to implement the shopping cart total price calculation function.

1. Establish database and data table

First, we need to create a database to store data related to products and shopping carts. You can use MySQL or other relational databases to create a database named "shop". Next, create two data tables in the database: one is "products" to store product information, and the other is "carts" to store information about the products in the shopping cart.

The structure of the products table is as follows:

CREATE TABLE products (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100) NOT NULL,
    price FLOAT(10, 2) NOT NULL,
    quantity INT(11) NOT NULL
);

The structure of the carts table is as follows:

CREATE TABLE carts (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    product_id INT(11) NOT NULL,
    quantity INT(11) NOT NULL,
    FOREIGN KEY (product_id) REFERENCES products(id)
);

2. Display the product list and add to the shopping cart

On the web page Displaying a product list and adding products to the shopping cart is a common operation. This functionality can be achieved using PHP and HTML. First, create an index.php file to display the product list. In this file, first connect to the database, then query the information of all products from the "products" table, and display it on the web page through a loop. For each item, you can add an "Add to Cart" button and pass the item's ID as a parameter to the Add to Cart action.

The operation of adding to the shopping cart can be implemented in a cart.php file. In this file, first connect to the database, then receive the product id parameter from the index.php page, and store the product id and quantity in the "carts" table. At the same time, you can also provide a "continue shopping" button to return to the product list page.

3. Calculate the total price of the shopping cart

In order to calculate the total price of the shopping cart, you can create a cart_total.php file. In this file, first connect to the database, and then query the "carts" table and "products" table to obtain information about each product in the shopping cart, including the price and quantity of the product. You can then loop through to calculate the total price of the shopping cart and display it on the web page.

At the same time, some other functions can also be provided, such as increasing or decreasing the number of items in the shopping cart, or deleting an item in the shopping cart. These functions can be achieved by adding corresponding operations in the cart.php file.

4. Settlement and Payment

When the user completes the shopping and confirms the settlement, a checkout.php file can be created. In this file, you can first connect to the database, and then query the "carts" table and "products" table to obtain information about each product in the shopping cart. You can then loop through to calculate the total price of the shopping cart and display it on the web page.

Next, a payment API can be introduced to implement payment operations. After the user fills in the relevant information and clicks the payment button, the system will pass the product information and total price in the shopping cart to the payment API and perform payment processing. Generally speaking, the payment API will return a result of successful or failed payment.

Summary:

Using PHP Developer City to implement the shopping cart total price calculation function is a relatively complex process, which requires the establishment of databases and data tables to store data related to products and shopping carts. At the same time, it is also necessary to display the product list on the web page and add the products to the shopping cart, calculate the total price of the shopping cart, and provide settlement and payment functions. Through the implementation of the above steps, the user's needs for browsing, managing and settling the items in the shopping cart can be met.

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