在Slim框架中使用会话（Sessions）进行用户认证的方法

composer require slim/slim

class SessionManager {

    public static function start() {
        session_start();
    }

    public static function setUser($user) {
        $_SESSION['user'] = $user;
    }

    public static function getUser() {
        return $_SESSION['user'] ?? null;
    }

    public static function isLoggedIn() {
        return isset($_SESSION['user']);
    }

    public static function logout() {
        session_unset();
        session_destroy();
    }

}

require 'vendor/autoload.php';

use SlimSlim;

$app = new Slim();

$app->add(function($req, $res, $next) {
    SessionManager::start();
    $res = $next($req, $res);
    return $res;
});

$app->get('/login', function() use ($app) {
    // 显示登录表单
});

$app->post('/login', function() use ($app) {
    // 处理登录请求
    $username = $app->request->post('username');
    $password = $app->request->post('password');

    // 验证用户身份
    if ($username == 'admin' && $password == 'password') {
        SessionManager::setUser($username);
        $app->redirect('/dashboard');
    } else {
        $app->redirect('/login');
    }
});

$app->get('/logout', function() use ($app) {
    SessionManager::logout();
    $app->redirect('/login');
});

$app->get('/dashboard', function() use ($app) {
    // 检查用户是否已经认证，如果未认证则重定向到登录页面
    if (!SessionManager::isLoggedIn()) {
        $app->redirect('/login');
    }

    // 显示用户仪表盘页面
});

$app->run();