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php 实现注册登录

2026-02-15 09:48:37PHP

PHP 注册功能实现

创建数据库表（以MySQL为例）：

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']);
    $email = trim($_POST['email']);
    $password = trim($_POST['password']);

    // 验证输入
    if (empty($username) || empty($email) || empty($password)) {
        die("所有字段都必须填写");
    }

    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        die("无效的邮箱格式");
    }

    // 密码哈希
    $hashed_password = password_hash($password, PASSWORD_DEFAULT);

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

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

    if ($stmt->fetch()) {
        die("用户名或邮箱已被注册");
    }

    // 插入新用户
    $stmt = $db->prepare("INSERT INTO users (username, email, password) VALUES (?, ?, ?)");
    $stmt->execute([$username, $email, $hashed_password]);

    echo "注册成功！";
}
?>

<form method="post">
    <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>

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']);
    $password = trim($_POST['password']);

    if (empty($username) || empty($password)) {
        die("所有字段都必须填写");
    }

    // 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'])) {
        $_SESSION['user_id'] = $user['id'];
        $_SESSION['username'] = $user['username'];
        header("Location: dashboard.php");
        exit();
    } else {
        echo "用户名或密码错误";
    }
}
?>

<form method="post">
    <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>

用户验证与登出

登录验证（protected_page.php）：

<?php
session_start();

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

echo "欢迎, " . $_SESSION['username'];
?>

<a href="logout.php">登出</a>

登出功能（logout.php）：

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

安全增强措施

密码强度验证：

if (strlen($password) < 8) {
    die("密码必须至少8个字符");
}

if (!preg_match("/[A-Z]/", $password) || 
    !preg_match("/[a-z]/", $password) || 
    !preg_match("/[0-9]/", $password)) {
    die("密码必须包含大小写字母和数字");
}

防止SQL注入：始终使用预处理语句（如上例所示），不要直接将用户输入拼接到SQL查询中。

CSRF防护：

php 实现注册登录

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

// 表单中包含
<input type="hidden" name="token" value="<?php echo $_SESSION['token']; ?>">

// 验证token
if (!isset($_POST['token']) || $_POST['token'] !== $_SESSION['token']) {
    die("无效的CSRF令牌");
}

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