How to use PHP Developer City to implement shopping cart price calculation function

How to use PHP Developer City to implement the shopping cart price calculation function

Introduction:
With the vigorous development of the e-commerce industry, more and more companies have begun to build their own e-commerce platforms. One of the core functions of the mall is shopping cart price calculation. This article will introduce how to use PHP Developer City to implement the shopping cart price calculation function.

1. Shopping cart data structure design
Before we start developing the shopping cart price calculation function, we need to design a reasonable shopping cart data structure. Generally speaking, the data structure of the shopping cart should contain the following fields:

1. Product ID: a field that uniquely identifies the product;
2. Product Name: the name of the product;
3. Product price: the unit price of the product;
4. Product quantity: the quantity of the purchased product.

Based on the above fields, we can design a shopping cart table to store the product information added to the shopping cart by the user.

2. Adding and deleting shopping carts
When users browse products in the mall, they can add products to the shopping cart. When the user clicks the "Add to Cart" button, the product-related information needs to be saved to the shopping cart table. This involves PHP form processing.

1. Add product to shopping cart
   The front-end page needs to provide a product details page, which contains product-related information and an "Add to Shopping Cart" button. When the user clicks the button, the page will send a request to the backend through POST and submit the product information to the backend for processing.

In the PHP background code, we can use the $_POST global variable to obtain the product ID, product name, product unit price and product quantity passed by the front end. Using this information, we can write code to save the product information into the shopping cart table.

2. Delete items from the shopping cart
   Users can delete items in the shopping cart. When the user clicks the "Delete" button, the page will send a request to the background through GET and pass the product ID to the background for processing.

In the PHP background code, we can use the $_GET global variable to obtain product ID information. Using this information, we can write code to delete the corresponding item from the shopping cart table.

3. Shopping cart price calculation
Shopping cart price calculation is one of the important functions in the mall. When a user adds multiple items to the shopping cart, the prices of these items need to be added up to calculate the total price of the shopping cart and display the price to the user.

In PHP, we can obtain the product information purchased by the user by querying the shopping cart table, and accumulate the product prices. Finally, the total price is displayed to the user.

1. Query shopping cart data
   In PHP code, we can use SQL statements to query the shopping cart table to obtain the product information purchased by the user.
2. Calculate the total price
   By querying the product information obtained, we can write code to accumulate the product prices to get the total price of the shopping cart.
3. Display total price
   Finally, we can display the calculated total shopping cart price to the user.

Conclusion:
Through the introduction of this article, we have learned how to use the PHP Developer City to implement the shopping cart price calculation function. The data structure design of the shopping cart, the addition and deletion of items, and the calculation of the shopping cart price are all key steps to achieve this function. By properly designing and writing code, we can implement a complete shopping cart system to provide users with a convenient shopping experience.

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