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php实现登录源码

2026-03-13 08:01:00PHP

以下是一个基于PHP的简单登录系统实现示例，包含基础功能和安全性考虑：

php实现登录源码

数据库准备

创建用户表结构（MySQL示例）：

php实现登录源码

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

登录表单页面 (login.php)

<form action="authenticate.php" method="post">
    <label for="username">用户名：</label>
    <input type="text" id="username" name="username" required>

    <label for="password">密码：</label>
    <input type="password" id="password" name="password" required>

    <button type="submit">登录</button>
</form>

认证处理 (authenticate.php)

<?php
session_start();
require 'db_connection.php'; // 数据库连接文件

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

$stmt = $pdo->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 {
    $_SESSION['login_error'] = "无效的用户名或密码";
    header("Location: login.php");
    exit();
}
?>

数据库连接 (db_connection.php)

<?php
$host = 'localhost';
$db   = 'your_database';
$user = 'your_username';
$pass = 'your_password';
$charset = 'utf8mb4';

$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$options = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES   => false,
];

try {
    $pdo = new PDO($dsn, $user, $pass, $options);
} catch (\PDOException $e) {
    throw new \PDOException($e->getMessage(), (int)$e->getCode());
}
?>

用户注册示例 (register.php)

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    require 'db_connection.php';

    $username = trim($_POST['username']);
    $password = password_hash($_POST['password'], PASSWORD_DEFAULT);
    $email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

    try {
        $stmt = $pdo->prepare("INSERT INTO users (username, password, email) VALUES (?, ?, ?)");
        $stmt->execute([$username, $password, $email]);
        header("Location: login.php");
        exit();
    } catch (PDOException $e) {
        $error = "注册失败: " . $e->getMessage();
    }
}
?>

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

安全注意事项

密码必须使用password_hash()函数进行哈希处理所有数据库查询使用预处理语句防止SQL注入对用户输入进行适当的清理和验证考虑添加CSRF保护令牌实现登录尝试限制防止暴力破解使用HTTPS保护传输中的敏感数据

会话管理

// 检查登录状态
session_start();
if (!isset($_SESSION['user_id'])) {
    header("Location: login.php");
    exit();
}

// 登出功能
session_start();
session_destroy();
header("Location: login.php");
exit();

这个实现包含了基础登录系统的核心组件，可根据实际需求扩展更多功能如记住我、密码重置等。