when laravel __construct method invok code example

Example 1: laravel create controller command

php artisan make:controller UserController

Example 2: laravel controller middleware

class UserController extends Controller
{
    /**
     * Instantiate a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('auth');

        $this->middleware('log')->only('index');

        $this->middleware('subscribed')->except('store');
    }
}