How to pass data to main.php(frontend/views/layouts) page?

Question

Yii

Hello, tell me how to pass data to the menu header of the main.php page?

Answer 1

Good morning.
In the controller

public $main_layout;

public actionIndex()
{
   $this->main_layout = 'TESTING';
}

In main.php
echo $this->context->main_layout;