关于 Laravel Session 的困惑，望高手解决

<code>    /**
     * The application's route middleware groups.
     *
     * @var array
     */
    protected $middlewareGroups = [
        'web' => [
            \App\Http\Middleware\EncryptCookies::class,
            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
            \Illuminate\Session\Middleware\StartSession::class,   //<---------
            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
            \App\Http\Middleware\VerifyCsrfToken::class,
        ],
        'api' => [
            'throttle:60,1',
            'bindings',
        ],
    ];</code>

<code>    /**
     * Get the middleware for the route's controller.
     *
     * @return array
     */
    public function controllerMiddleware()
    {
        if (! $this->isControllerAction()) {
            return [];
        }

        return ControllerDispatcher::getMiddleware(
            $this->getController(), $this->getControllerMethod()
        );
    }</code>

<code>/**
 * 控制层公有方法集合
 * Class BaseController
 */
abstract class BaseController extends Controller
{

    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;

    public $login_user_info;
    public $login_subuser_info;

    public function __construct()
    {
        $this->userModel    = app(UserModel::class);
        if (session()->get('user_id')) {
            $this->login_user_info          = $this->userModel->getLoginUser();
            //设置模板全局变量
            view()->share(['login_user_info' => $this->login_user_info]);
        }
    }</code>