php论坛代码
php<?php
session_start();
// 数据库连接
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "forum";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
// 用户注册
if(isset($_POST['register'])) {
$username = $_POST['username'];
$password = $_POST['password'];
$sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
$conn->query($sql);
echo "注册成功！";
}
// 用户登录
if(isset($_POST['login'])) {
$username = $_POST['username'];
$password = $_POST['password'];
$sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$result = $conn->query($sql);
if($result->num_rows > 0) {
$_SESSION['username'] = $username;
echo "登录成功！";
} else {
echo "用户名或密码错误！";
}
}
// 发帖
if(isset($_POST['create_post'])) {
$title = $_POST['title'];
$content = $_POST['content'];
$username = $_SESSION['username'];
$sql = "INSERT INTO posts (title, content, author) VALUES ('$title', '$content', '$username')";
$conn->query($sql);
echo "帖子发布成功！";
}
// 回帖
if(isset($_POST['reply'])) {
$post_id = $_POST['post_id'];
$content = $_POST['content'];
$username = $_SESSION['username'];
$sql = "INSERT INTO replies (post_id, content, author) VALUES ('$post_id', '$content', '$username')";
$conn->query($sql);
echo "回帖成功！";
}
// 展示帖子及回帖
$sql = "SELECT * FROM posts";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo "标题: " . $row["title"]. " - 作者: " . $row["author"]. " - 内容: " . $row["content"]. "<br>";
// 查询回帖
$post_id = $row['id'];
$reply_sql = "SELECT * FROM replies WHERE post_id='$post_id'";
$reply_result = $conn->query($reply_sql);
if ($reply_result->num_rows > 0) {
while($reply_row = $reply_result->fetch_assoc()) {
echo " 回帖: " . $reply_row["content"]. " - 作者: " . $reply_row["author"]. "<br>";
}
}
}
} else {
echo "暂无帖子！";
}
$conn->close();
?>
此代码仅作为示例，没有包含任何安全性措施，在实际应用中，务必添加适当的安全性检查和防护措施。
php<!DOCTYPE html>
<html>
<head>
<title>简易论坛</title>
</head>
<body>
<h2>用户注册</h2>
<form method="post" action="">
用户名: <input type="text" name="username"><br>
密码: <input type="password" name="password"><br>
<input type="submit" name="register" value="注册">
</form>
<h2>用户登录</h2>
<form method="post" action="">
用户名: <input type="text" name="username"><br>
密码: <input type="password" name="password"><br>
<input type="submit" name="login" value="登录">
</form>
<?php if(isset($_SESSION['username'])): ?>
<h2>发帖</h2>
<form method="post" action="">
标题: <input type="text" name="title"><br>
内容: <textarea name="content"></textarea><br>
<input type="submit" name="create_post" value="发布帖子">
</form>
<h2>回帖</h2>
<form method="post" action="">
帖子ID: <input type="text" name="post_id"><br>
内容: <textarea name="content"></textarea><br>
<input type="submit" name="reply" value="回帖">
</form>
<?php endif; ?>
</body>
</html>
此 HTML 代码包含了注册、登录、发帖和回帖的表单。根据用户是否登录，展示相应的表单。用户成功登录后，会话变量 $_SESSION['username'] 会被设置为当前用户名，以便在后续的操作中识别用户身份。
此代码仍然非常简单，并且缺少许多功能和安全性检查。在实际使用中，需要进一步完善代码，包括但不限于数据验证、用户权限管理、数据过滤和适当的错误处理。
