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php实现注册登陆

2026-01-15 12:34:17PHP

PHP 注册功能实现

创建数据库表结构（MySQL示例）：

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

注册表单处理（register.php）：

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $username = trim($_POST['username']);
    $email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
    $password = $_POST['password'];

    // 验证输入
    if (empty($username) || empty($email) || empty($password)) {
        $error = "所有字段必须填写";
    } elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $error = "邮箱格式无效";
    } else {
        // 密码哈希处理
        $hashed_password = password_hash($password, PASSWORD_DEFAULT);

        // 数据库连接
        $db = new PDO('mysql:host=localhost;dbname=your_db', 'username', 'password');

        // 检查用户名是否已存在
        $stmt = $db->prepare("SELECT id FROM users WHERE username = ? OR email = ?");
        $stmt->execute([$username, $email]);

        if ($stmt->fetch()) {
            $error = "用户名或邮箱已存在";
        } else {
            // 插入新用户
            $stmt = $db->prepare("INSERT INTO users (username, email, password) VALUES (?, ?, ?)");
            if ($stmt->execute([$username, $email, $hashed_password])) {
                header("Location: login.php?registered=1");
                exit;
            }
        }
    }
}
?>

PHP 登录功能实现

登录表单处理（login.php）：

<?php
session_start();

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

    // 数据库连接
    $db = new PDO('mysql:host=localhost;dbname=your_db', 'username', 'password');

    // 查询用户
    $stmt = $db->prepare("SELECT id, username, password FROM users WHERE username = ?");
    $stmt->execute([$username]);
    $user = $stmt->fetch();

    if ($user && password_verify($password, $user['password'])) {
        // 登录成功
        $_SESSION['user_id'] = $user['id'];
        $_SESSION['username'] = $user['username'];
        header("Location: dashboard.php");
        exit;
    } else {
        $error = "用户名或密码错误";
    }
}
?>

安全增强措施

密码哈希使用最新算法：

$options = [
    'cost' => 12,
];
$hashed_password = password_hash($password, PASSWORD_BCRYPT, $options);

防止SQL注入：

// 使用预处理语句（如上示例所示）
// 永远不要直接拼接SQL查询

CSRF防护（在表单中添加）：

$_SESSION['token'] = bin2hex(random_bytes(32));

<input type="hidden" name="token" value="<?php echo $_SESSION['token']; ?>">

会话管理

登录状态检查：

session_start();
if (!isset($_SESSION['user_id'])) {
    header("Location: login.php");
    exit;
}

登出功能（logout.php）：

<?php
session_start();
session_destroy();
header("Location: login.php");
exit;
?>

前端表单示例

注册表单（register_form.html）：

<form method="post" action="register.php">
    <input type="text" name="username" placeholder="用户名" required>
    <input type="email" name="email" placeholder="邮箱" required>
    <input type="password" name="password" placeholder="密码" required>
    <button type="submit">注册</button>
</form>

登录表单（login_form.html）：

php实现注册登陆

<form method="post" action="login.php">
    <input type="text" name="username" placeholder="用户名" required>
    <input type="password" name="password" placeholder="密码" required>
    <button type="submit">登录</button>
</form>

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