Backend Development
PHP Tutorial
PHP development: How to implement article classification function
PHP development: How to implement article classification function
PHP development: Implementing article classification function
Introduction: Article classification is one of the most important functions on a website or blog. Through reasonable classification, it can help users quickly locate the information they need and improve user experience. This article will introduce how to use PHP to develop and implement the article classification function, and provide specific code examples.
1. Database design
Before implementing the article classification function, you first need to design a suitable database table. Suppose we have two tables: articles and categories.
The structure of the article table is as follows:
CREATE TABLE articles (
id INT AUTO_INCREMENT PRIMARY KEY,
title VARCHAR(255) NOT NULL,
content TEXT NOT NULL,
category_id INT NOT NULL,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);The structure of the classification table is as follows:
CREATE TABLE categories (
id INT AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(255) NOT NULL
);2. Implement the article classification function
- Display article classification List
First, we need to display a list of article categories to facilitate user selection. You can query the category list through the following code:
<?php
// 连接数据库
$mysqli = new mysqli("localhost", "root", "password", "database");
if ($mysqli->connect_errno) {
die("连接数据库失败: " . $mysqli->connect_error);
}
// 查询分类列表
$result = $mysqli->query("SELECT * FROM categories");
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
echo "<a href='category.php?id=".$row["id"]."'>".$row["name"]."</a><br>";
}
}
// 关闭数据库连接
$mysqli->close();
?>The above code displays the category name as a link by querying the category table in the database. Clicking the link will jump to the corresponding category page.
- Display a list of articles under a category
Next, we need to implement the function of displaying a list of articles under a certain category. You can query the list of articles in the corresponding category through the following code:
<?php
// 连接数据库
$mysqli = new mysqli("localhost", "root", "password", "database");
if ($mysqli->connect_errno) {
die("连接数据库失败: " . $mysqli->connect_error);
}
// 获取分类ID
$category_id = $_GET["id"];
// 查询分类信息
$category_result = $mysqli->query("SELECT * FROM categories WHERE id = ".$category_id);
if ($category_result->num_rows > 0) {
$category = $category_result->fetch_assoc();
echo "<h1>".$category["name"]."</h1>";
} else {
die("分类不存在");
}
// 查询分类下的文章列表
$articles_result = $mysqli->query("SELECT * FROM articles WHERE category_id = ".$category_id);
if ($articles_result->num_rows > 0) {
while ($row = $articles_result->fetch_assoc()) {
echo "<h2>".$row["title"]."</h2>";
echo "<p>".$row["content"]."</p>";
echo "<hr>";
}
} else {
echo "该分类下暂无文章";
}
// 关闭数据库连接
$mysqli->close();
?>The above code queries the corresponding category information based on the category ID passed in the URL, and then queries the list of articles under the category and displays it.
- Create an article and select a category
Finally, we need to implement the function of creating an article and selecting a category. This can be achieved through the following code:
<?php
// 连接数据库
$mysqli = new mysqli("localhost", "root", "password", "database");
if ($mysqli->connect_errno) {
die("连接数据库失败: " . $mysqli->connect_error);
}
// 获取表单提交的信息
$title = $_POST["title"];
$content = $_POST["content"];
$category_id = $_POST["category_id"];
// 插入文章
$insert_result = $mysqli->query("INSERT INTO articles (title, content, category_id) VALUES ('".$title."', '".$content."', ".$category_id.")");
if ($insert_result === true) {
echo "文章创建成功";
} else {
echo "创建文章失败: ".$mysqli->error;
}
// 关闭数据库连接
$mysqli->close();
?>The above code obtains the article title, content and category ID submitted by the form, and then inserts it into the article table.
Conclusion
The article classification function is one of the very common functions in websites or blogs. Through reasonable classification, user experience and information retrieval efficiency can be improved. This article introduces how to use PHP to develop and implement article classification functions, and provides specific code examples. Hope it helps all developers.
The above is the detailed content of PHP development: How to implement article classification function. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
How to use Memcache in PHP development?
Nov 07, 2023 pm 12:49 PM
In web development, we often need to use caching technology to improve website performance and response speed. Memcache is a popular caching technology that can cache any data type and supports high concurrency and high availability. This article will introduce how to use Memcache in PHP development and provide specific code examples. 1. Install Memcache To use Memcache, we first need to install the Memcache extension on the server. In CentOS operating system, you can use the following command
Describe the SOLID principles and how they apply to PHP development.
Apr 03, 2025 am 12:04 AM
The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.
How to implement version control and code collaboration in PHP development?
Nov 02, 2023 pm 01:35 PM
How to implement version control and code collaboration in PHP development? With the rapid development of the Internet and the software industry, version control and code collaboration in software development have become increasingly important. Whether you are an independent developer or a team developing, you need an effective version control system to manage code changes and collaborate. In PHP development, there are several commonly used version control systems to choose from, such as Git and SVN. This article will introduce how to use these tools for version control and code collaboration in PHP development. The first step is to choose the one that suits you
How to use Memcache for efficient data writing and querying in PHP development?
Nov 07, 2023 pm 01:36 PM
How to use Memcache for efficient data writing and querying in PHP development? With the continuous development of Internet applications, the requirements for system performance are getting higher and higher. In PHP development, in order to improve system performance and response speed, we often use various caching technologies. One of the commonly used caching technologies is Memcache. Memcache is a high-performance distributed memory object caching system that can be used to cache database query results, page fragments, session data, etc. By storing data in memory
How to use PHP to develop the coupon function of the ordering system?
Nov 01, 2023 pm 04:41 PM
How to use PHP to develop the coupon function of the ordering system? With the rapid development of modern society, people's life pace is getting faster and faster, and more and more people choose to eat out. The emergence of the ordering system has greatly improved the efficiency and convenience of customers' ordering. As a marketing tool to attract customers, the coupon function is also widely used in various ordering systems. So how to use PHP to develop the coupon function of the ordering system? 1. Database design First, we need to design a database to store coupon-related data. It is recommended to create two tables: one
How to use caching to improve system performance in PHP development?
Nov 04, 2023 pm 01:39 PM
How to use caching to improve system performance in PHP development? In today's era of rapid Internet development, system performance has become a crucial indicator. For PHP development, caching is an important means to improve system performance. This article will explore how to use caching in PHP development to improve system performance. 1. Why use caching to improve system performance: Caching can reduce frequent access to resources such as databases, thereby reducing system response time and improving system performance and throughput. Reduce server load: By using caching, you can reduce
What is the method to implement the takeout order tracking function of PHP development ordering system?
Nov 01, 2023 am 08:58 AM
With the booming takeout business, major restaurants and takeout platforms are competing to launch ordering systems. The takeout order tracking function has become a feature that both customers and restaurants are paying close attention to. So, how do we implement the takeout order tracking function in the ordering system developed in PHP? 1. Front-end page design First, we need to design a front-end page so that users can easily check the order status. The following points need to be noted in the design of the front-end page: the interface is simple and clear, and users can quickly find the entrance to the order tracking function. In the process of order tracking
How to use PHP to develop the member points function of the grocery shopping system?
Nov 01, 2023 am 10:30 AM
How to use PHP to develop the member points function of the grocery shopping system? With the rise of e-commerce, more and more people choose to purchase daily necessities online, including grocery shopping. The grocery shopping system has become the first choice for many people, and one of its important features is the membership points system. The membership points system can attract users and increase their loyalty, while also providing users with an additional shopping experience. In this article, we will discuss how to use PHP to develop the membership points function of the grocery shopping system. First, we need to create a membership table to store users
