Use PHP to develop the question author and answerer area functions in the knowledge Q&A website.

Use PHP to develop the question author and answerer area functions in the knowledge Q&A website

In today's information age, people's demand for knowledge is growing day by day. In order to facilitate users to obtain and share knowledge, knowledge question and answer websites are gradually emerging. In order to provide a better user experience, many question and answer websites have introduced question author and answerer area functions. This article explains how to develop such functionality using PHP.

The purpose of the question author and answerer area functions is to allow users to distinguish their identities in the Q&A website. The question author area provides a dedicated page to display information about question authors and the questions they raised. The respondent area is used to display the respondent's personal information and their answer records.

First, we need to create a database to store user information and their Q&A records. Suppose we have two tables, one for storing user information and another for storing question and answer records. The following are the SQL statements to create these two tables:

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(255),
    email VARCHAR(255)
);

CREATE TABLE questions (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT,
    title VARCHAR(255),
    content TEXT,
    FOREIGN KEY (user_id) REFERENCES users(id)
);

CREATE TABLE answers (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT,
    question_id INT,
    content TEXT,
    FOREIGN KEY (user_id) REFERENCES users(id),
    FOREIGN KEY (question_id) REFERENCES questions(id)
);

Next, we use PHP and MySQLi extensions to connect to the database to implement user registration and login functions. The following is a simple sample code:

<?php
// 连接数据库
$db = new mysqli('localhost', 'username', 'password', 'database');

// 验证用户注册信息
if(isset($_POST['register'])) {
    $username = $_POST['username'];
    $email = $_POST['email'];
    
    // 将用户信息插入到 users 表中
    $query = "INSERT INTO users (username, email) VALUES ('$username', '$email')";
    $db->query($query);
    
    // 跳转到登录页面
    header('Location: login.php');
    exit;
}

// 验证用户登录信息
if(isset($_POST['login'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // 查询 users 表中是否存在匹配的用户
    $query = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
    $result = $db->query($query);
    
    // 如果存在匹配的用户，则跳转到用户的专区页面
    if($result->num_rows == 1) {
        session_start();
        $_SESSION['username'] = $username;
        header('Location: profile.php');
        exit;
    }
    
    // 否则，显示登录失败的提示信息
    $error = '登录失败，请检查用户名和密码是否正确。';
}
?>

After the user successfully registers or logs in, we can store the user's identity information in the Session and use this information in other pages. The following is a simple sample code:

<?php
// 在用户登录成功后，将用户名存储在 Session 中
session_start();
$username = $_SESSION['username'];

// 连接数据库
$db = new mysqli('localhost', 'username', 'password', 'database');

// 查询用户在 questions 表中的数据
$query = "SELECT * FROM questions WHERE username = '$username'";
$result = $db->query($query);

// 在用户的专区页面中展示问题
while($row = $result->fetch_assoc()) {
    echo "<h3>{$row['title']}</h3>";
    echo "<p>{$row['content']}</p>";
    echo "<hr>";
}

// 查询用户在 answers 表中的数据
$query = "SELECT * FROM answers WHERE username = '$username'";
$result = $db->query($query);

// 在用户的专区页面中展示回答
while($row = $result->fetch_assoc()) {
    echo "<p>{$row['content']}</p>";
    echo "<hr>";
}
?>

Through the above code sample, we can implement a simple question author and answerer area function. Users can perform corresponding operations on the registration and login pages. After success, they can see relevant questions and answer records in their area pages. This feature helps users understand their own contributions to the Q&A website and the reviews of other users.

In summary, PHP is an excellent tool for developing question author and answerer area functions in a quiz website. Through reasonable database design and PHP code writing, we can easily implement such a function. I hope this article is helpful to you, thank you for reading!

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