Laravel中做登录，真的太简单了，框架已经集成了大多数的功能，我们只需要把相关数据传递过去即可。代码如下：

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class LoginController extends Controller
{
    public function index()
    {
        // 如果用户已登录，则直接跳转到之前页面
        if (Auth::check()) {    
            return redirect(url()->previous());
        }
      
        return view('login');
    }

    public function login(Request $request)
    {
        $credentials = $request->validate([
            'username' => ['required'],
            'password' => ['required'],
        ]);
 
        if (Auth::attempt($credentials, $request->remember)) {
            $request->session()->regenerate(); 
            return redirect()->intended();
        }
 
        return back()->withErrors([
            'loginError' => '用户名或密码不正确。',
        ])->onlyInput('username');
    }

    public function logout(Request $request)
    {
        Auth::logout();
        $request->session()->invalidate();
        $request->session()->regenerateToken();
        return redirect('/')->with('success', '退出成功！');
    }
}

相应的路由如下：

Route::get('/login', [LoginController::class, 'index'])->name('login.index');
Route::post('/login', [LoginController::class, 'login'])->name('login');
Route::get('/logout', [LoginController::class, 'logout'])->middleware('auth')->name('logout');