php_laravel_laracasts/app/Http/Controllers/SessionsController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class SessionsController extends Controller
{
    public function __construct()
    {
        $this->middleware('guest')->only('store');
    }

    public function create()
    {
        return view('sessions.create');
    }

    public function destroy() {
        auth()->logout();
        return redirect()->home();
    }

    public function store()
    {
        // Attempt to authenticate the user.
        // On failure, redirect back.
        if (!auth()->attempt(request(['email', 'password']))) {
            return back()->withErrors([
                'message' => 'Please check your credentials and try again',
            ]);
        };

        // On success, sign them in.

        // Then redirect to home.
        return redirect()->home();
    }
}