How to call assets folder inside the controller

I have folder named 'auto' inside the assets folder. I am working on running php script.

Here I have given absolute path for run.php.

My question is how to call assets folder

 $phpScript = Helpers::joinPath(
            "C:\\xampp\\htdocs\\project_name\\assets\\auto\\task", 
            "run.php "
        );

via Chebli Mohamed