How to display data from the database in Yii2 layouts?

Question

Yii

I need to display data from the database to the header of the site - this is the template layouts-> main.php
Where and how to get data from the database and how exactly to transfer it to main?

Answer 1

Via widget or app settings

Answer 2

Good morning.
Data can be obtained in the model, it can be in the controller.
To pass data to the template, do the following.
In the desired controller, create a public variable, let's call it test. In the same controller, give it a value and call it in the template.

// 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;
        }