How to use PHP to develop the price filtering and sorting functions of the grocery shopping system?

With the development of logistics and information technology, online shopping has become an indispensable part of daily life. Among them, fresh food shopping has also begun to shift to online purchasing, which has led to the development of a food shopping system. In the grocery shopping system, price filtering and sorting functions are important factors for users to select products. Therefore, this article introduces how to use PHP to develop the price filtering and sorting functions of the grocery shopping system.

1. Design database

In the grocery shopping system, product information needs to be stored in the database. Therefore, we need to first design the table structure of product information in the database. Product information in the grocery shopping system may include product name, price, pictures and other related information, so we need to design at least one goods table to store product information.

CREATE TABLE goods (
id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
name VARCHAR(255) NOT NULL,
price INT(11) NOT NULL,
image VARCHAR (255) NOT NULL,
PRIMARY KEY (id)
);

2. Develop filtering and sorting functions

2.1 Filtering function

In shopping for groceries In the system, users need to be able to filter products based on price. Therefore, we need to develop a functional module for price screening. We can add filtering conditions to the page and submit the form, and the filtering function is implemented by querying the database in the background.

The development steps are as follows:

1. Add filter conditions to the page

< ;label for="min_price">Minimum price:

Maximum price:

2. Background query database

// Get the lowest price and sum passed by the form Maximum price
$min_price = $_GET['min_price'];
$max_price = $_GET['max_price'];

// Filter products based on price
$sql = "SELECT * FROM goods WHERE price >= $min_price AND price

// Execute query and display data
// ...
?>

2.2 Sorting function

In addition to the filtering function, the grocery shopping system should also provide a sorting function. Users need to be able to sort by price in ascending or descending order. Therefore, we need to develop a functional module for price sorting.

The development steps are as follows:

1. Add sorting conditions to the page

Sort:

Ascending price
Descending price

2. Background query database

// Get sorting method
$sort = $_GET['sort_price'];

// Sort goods by price
$sql = "SELECT * FROM goods ORDER BY price $sort";

// Execute query and display data
// ...
?>

3. Summary

In this article, we introduce how to use PHP to develop the price filtering and sorting functions of the grocery shopping system. By designing the database table structure and developing filtering and sorting modules, we can make it easier for users to filter and sort products. Of course, in actual development, issues such as SEO and mobile terminal adaptation also need to be considered, but they are not discussed here.

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