Yii2 how to pass data from db to layout once?

Question

Yii

Hello.
--
There is a solution that allows you to display content in a layout:

// в контроллере
public $test

public function actionIndex(){
  $this->test = // присвоить значение, или результат работы метода
}

// в шаблоне 
        if(isset($this->context->test) && $this->context->test != null)
        {
            echo $this->context->test;
        }

This means that if I forget to specify this construction in the controller , or rather in a specific action , then the site on this page will simply collapse, I would like to know how to display this once in the layout, without repeating in actions, and without displaying a direct request to bd, by type:

$x = Site::find()->where(['public' => $act])->all();

If there is no other way, just write like this, short and clear. Thank you for your tolerance for the issue and respect for the desire to code correctly.

Answer 1

Create a widget that performs the functionality you need and display it in a layer