How to write a full path to functions in Yii2?

Question

Yii

I prescribe a function and when I want to apply it by prescribing its path like this \\app\controllers\debug(Yii::$app);
I get an error: Call to undefined function app\controllers\debug()

Answer 1

If you haven't rewritten the autoload algorithm, then you can't call the function this way. So you can only call a class method. And the call should then be something like:

$controller = new \\app\controllers\DebugController();
$controller->debug(Yii::$app);

In your particular case, it would be more correct to write a helper

namespace app\helpers;

class SystemHelper
{
    public static function debug($app)
    {
        //Код функции
    }
}

And then call it
\app\helpers\SystemHelper::debug(Yii::$app);

Answer 2

use function app\controllers\debug;
along with other use write..