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How to use PHP to develop a simple classified information publishing system
Foreword:
The classified information publishing system is a common website application that allows users to Publish various categories of information, such as second-hand items, rental information, recruitment information, etc. This article will introduce how to use the PHP programming language to develop a simple classified information publishing system and provide corresponding code examples.
(1) User registration and login: Users should be able to register a new account and log in to the system using the account.
(2) Publishing and management of classified information: Users should be able to publish various classified information and manage the published information.
(3) Information display and search: The system should be able to display published information and provide a search function to facilitate users to quickly find information of interest.
(1) User table (user): Contains the user's basic information, such as user ID, user name, password, etc.
(2) Classification information table (category): Contains basic information of classification information, such as information ID, title, content, etc.
(3) User information association table (user_category): used to associate users with published classification information.
(1) Create user table:
CREATE TABLE user
(
id
int(11) NOT NULL AUTO_INCREMENT,
username
varchar(255) NOT NULL,
password
varchar(255) NOT NULL,
PRIMARY KEY (id
)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
(2) Implementation of registration function:
// Get user submissions Form data
$username = $_POST['username'];
$password = $_POST['password'];
// Insert the data submitted by the user into the user table
$sql = "INSERT INTO user (username, password) VALUES ('$username', '$password')";
// Execute SQL statement
// ...
// Jump to the login page after successful registration
header('Location: login.php');
?>
(3) Implementation of login function:
// Get form data submitted by the user
$username = $_POST['username'];
$password = $_POST['password'];
/ / Find matching username and password in the user table
$sql = "SELECT * FROM user WHERE username = '$username' AND password = '$password'";
// Execute SQL statement
/ / ...
// If a matching user is found, the login is successful
if ($user) {
// 保存用户登录状态 session_start(); $_SESSION['user_id'] = $user['id']; // 跳转到用户首页 header('Location: user_home.php');
} else {
// 登录失败 echo '用户名或密码错误';
}
?>
(1) Create a classification information table:
CREATE TABLE category
(
id
int(11) NOT NULL AUTO_INCREMENT,
title
varchar(255) NOT NULL,
content
varchar(255) NOT NULL,
user_id
int(11) NOT NULL,
PRIMARY KEY (id
),
FOREIGN KEY (user_id
) REFERENCES user
(id
)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
(2) Implementation of publishing information function:
// Get users Submitted form data
$title = $_POST['title'];
$content = $_POST['content'];
$user_id = $_SESSION['user_id'];
// Insert the information published by the user into the category information table
$sql = "INSERT INTO category (title, content, user_id) VALUES ('$title', '$content', '$user_id')" ;
// Execute SQL statement
// ...
// Jump to the information list page after successful publishing
header('Location: category_list.php');
?>
(3) Implementation of the information management function:
// Get all the information posted by the user based on the user ID
$user_id = $ _SESSION['user_id'];
$sql = "SELECT * FROM category WHERE user_id = '$user_id'";
// Execute SQL statement
// ...
/ / Traverse the query results and display the information posted by the user
foreach ($categories as $category) {
// ...
}
?>
(1) Implementation of the information list display function:
// 查询所有已发布的信息
$sql = "SELECT * FROM category";
// 执行SQL语句
// ...
// 遍历查询结果,展示所有信息
foreach ($categories as $category) {
// ...
}
?>
(2)搜索功能的实现:
// 获取用户提交的搜索关键字
$keyword = $_POST['keyword'];
// 根据关键字查询匹配的信息
$sql = "SELECT * FROM category WHERE title LIKE '%$keyword%'";
// 执行SQL语句
// ...
// 遍历查询结果,展示匹配的信息
foreach ($categories as $category) {
// ...
}
?>
总结:
本文介绍了如何使用PHP编程语言来开发一个简单的分类信息发布系统。通过以上示例,我们可以看到,利用PHP开发一个分类信息发布系统并不复杂,只需正确设计数据库结构,实现相应的功能模块即可。当然,这只是一个简化的示例,实际情况中还需要考虑安全性、性能等方面的问题。希望本文能对您有所帮助,谢谢阅读!
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