yii2 中 controller 向layout 传值

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方式一：
controller 中

class BlogController extends Controller{
    public $layout = "newlayout";
    public $menu = "";
    public function actionIndex(){

        $this->menu = "menumenu";
        return $this->render("index");
    }
}

layout 中

<?= $this->context->menu ?>

方式2

controller 中

class BlogController extends Controller{
    public $layout = "newlayout";
    public function actionIndex(){
        $view = YII::$app->view;
        $view->params["menu"] = "menumenu";
        return $this->render("index");
    }
}

layout 中

$this->params["menu"]