PHP论坛系统源码,如何自己搭建vps上游戏,全球vps主机交流论坛,巴西vps,欧洲vps价格

🗣 Wd提问: PHP论坛系统源码

🤖 Ai回答:
创建一个简单的PHP论坛系统可以帮助你理解如何构建基本的Web应用程序。以下是一个非常基础的示例，展示了如何使用PHP、MySQL和HTML来实现一个简单的论坛系统。请注意，这只是一个起点，实际应用中需要更多的安全性和功能扩展。

1、数据库设计

首先，我们需要设计数据库表来存储用户、主题和回复信息。假设我们有三个表：`users`（用户）、`topics`（主题）和`replies`（回复）。

sql
CREATE DATABASE forum;

USE forum;

用户表
CREATE TABLE users (
id INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(50) NOT NULL UNIQUE,
password VARCHAR(255) NOT NULL,
email VARCHAR(100),
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

主题表
CREATE TABLE topics (
id INT AUTO_INCREMENT PRIMARY KEY,
user_id INT,
title VARCHAR(255) NOT NULL,
content TEXT NOT NULL,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
FOREIGN KEY (user_id) REFERENCES users(id)
);

回复表
CREATE TABLE replies (
id INT AUTO_INCREMENT PRIMARY KEY,
topic_id INT,
user_id INT,
content TEXT NOT NULL,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
FOREIGN KEY (topic_id) REFERENCES topics(id),
FOREIGN KEY (user_id) REFERENCES users(id)
);

2、注册和登录功能

接下来，我们编写PHP代码来处理用户的注册和登录。

`register.php`

php
<?php
session_start();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$username = $_POST['username'];
$password = password_hash($_POST['password'], PASSWORD_DEFAULT);
$email = $_POST['email'];

// 连接数据库
$conn = new mysqli('localhost', 'root', '', 'forum');

if ($conn-connect_error) {
die(Connection failed: 、$conn-connect_error);
}

// 检查用户名是否已存在
$stmt = $conn-prepare(SELECT id FROM users WHERE username = ?);
$stmt-bind_param(s, $username);
$stmt-execute();
$stmt-store_result();

if ($stmt-num_rows 0) {
echo Username already exists!;
} else {
// 插入新用户
$stmt = $conn-prepare(INSERT INTO users (username, password, email) VALUES (?, ?, ?));
$stmt-bind_param(sss, $username, $password, $email);

if ($stmt-execute()) {
echo Registration successful!;
} else {
echo Error: 、$stmt-error;
}
}

$stmt-close();
$conn-close();
}
?

<!DOCTYPE html
<html
<head
<titleRegister</title
</head
<body
<form method=post action=
<input type=text name=username placeholder=Username required<br
<input type=password name=password placeholder=Password required<br
<input type=email name=email placeholder=Email required<br
<button type=submitRegister</button
</form
</body
</html

`login.php`

php
<?php
session_start();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$username = $_POST['username'];
$password = $_POST['password'];

// 连接数据库
$conn = new mysqli('localhost', 'root', '', 'forum');

if ($conn-connect_error) {
die(Connection failed: 、$conn-connect_error);
}

// 验证用户
$stmt = $conn-prepare(SELECT id, password FROM users WHERE username = ?);
$stmt-bind_param(s, $username);
$stmt-execute();
$stmt-bind_result($id, $hashed_password);
$stmt-fetch();

if (password_verify($password, $hashed_password)) {
$_SESSION['user_id'] = $id;
header('Location: index.php');
} else {
echo Invalid username or password!;
}

$stmt-close();
$conn-close();
}
?

<!DOCTYPE html
<html
<head
<titleLogin</title
</head
<body
<form method=post action=
<input type=text name=username placeholder=Username required<br
<input type=password name=password placeholder=Password required<br
<button type=submitLogin</button
</form
</body
</html

3、发布主题和回复

`index.php`

php
<?php
session_start();

// 连接数据库
$conn = new mysqli('localhost', 'root', '', 'forum');

if ($conn-connect_error) {
die(Connection failed: 、$conn-connect_error);
}

// 获取所有主题
$topics = $conn-query(SELECT t.*, u.username FROM topics t JOIN users u ON t.user_id = u.id ORDER BY t.created_at DESC);

if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_SESSION['user_id'])) {
$title = $_POST['title'];
$content = $_POST['content'];
$user_id = $_SESSION['user_id'];

$stmt = $conn-prepare(INSERT INTO topics (user_id, title, content) VALUES (?, ?, ?));
$stmt-bind_param(iss, $user_id, $title, $content);

if ($stmt-execute()) {
header('Location: index.php');
} else {
echo Error: 、$stmt-error;
}
}
?

<!DOCTYPE html
<html
<head
<titleForum</title
</head
<body
<?php if (isset($_SESSION['user_id'])): ?
<h2Create a New Topic</h2
<form method=post action=
<input type=text name=title placeholder=Title required<br
<textarea name=content placeholder=Content required</textarea<br
<button type=submitPost</button
</form
<?php endif; ?

<h2Topics</h2
<?php while ($topic = $topics-fetch_assoc()): ?
<div
<h3<?php echo htmlspecialchars($topic['title']); ?</h3
<pBy <?php echo htmlspecialchars($topic['username']); ? on <?php echo $topic['created_at']; ?</p
<p<?php echo nl2br(htmlspecialchars($topic['content'])); ?</p
<a href=view_topic.php?id=<?php echo $topic['id']; ?View Replies</a
</div
<?php endwhile; ?

<a href=login.phpLogin</a | <a href=register.phpRegister</a
</body
</html

`view_topic.php`

php
<?php
session_start();

$id = intval($_GET['id']);

// 连接数据库
$conn = new mysqli('localhost', 'root', '', 'forum');

if ($conn-connect_error) {
die(Connection failed: 、$conn-connect_error);
}

// 获取主题
$stmt = $conn-prepare(SELECT t.*, u.username FROM topics t JOIN users u ON t.user_id = u.id WHERE t.id = ?);
$stmt-bind_param(i, $id);
$stmt-execute();
$topic = $stmt-get_result()-fetch_assoc();

if (!$topic) {
die(Topic not found!);
}

// 获取回复
$replies = $conn-query(SELECT r.*, u.username FROM replies r JOIN users u ON r.user_id = u.id WHERE r.topic_id = $id ORDER BY r.created_at ASC);

if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_SESSION['user_id'])) {
$content = $_POST['content'];
$user_id = $_SESSION['user_id'];

$stmt = $conn-prepare(INSERT INTO replies (topic_id, user_id, content) VALUES (?, ?, ?));
$stmt-bind_param(iis, $id, $user_id, $content);

if ($stmt-execute()) {
header('Location: view_topic.php?id=' 、$id);
} else {
echo Error: 、$stmt-error;
}
}
?

<!DOCTYPE html
<html
<head
<titleView Topic</title
</head
<body
<h2<?php echo htmlspecialchars($topic['title']); ?</h2
<pBy <?php echo htmlspecialchars($topic['username']); ? on <?php echo $topic['created_at']; ?</p
<p<?php echo nl2br(htmlspecialchars($topic['content'])); ?</p

<h3Replies</h3
<?php while ($reply = $replies-fetch_assoc()): ?
<div
<pBy <?php echo htmlspecialchars($reply['username']); ? on <?php echo $reply['created_at']; ?</p
<p<?php echo nl2br(htmlspecialchars($reply['content'])); ?</p
</div
<?php endwhile; ?

<?php if (isset($_SESSION['user_id'])): ?
<h3Post a Reply</h3
<form method=post action=
<textarea name=content placeholder=Content

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