PHP function call_user_func() in Laravel

Hello guys! :D

I have a problem with PHP function call_user_func() in Laravel project. I am testing this function in plain PHP (v 7.0) project and work, but in Laravel doesn't work.

What exactly I want?

I want take parametar from URL (this is a string OK?). When I take parametar (string), I put in function and call object and static method. It is a dynamic calling of objects. For example:

function call_user_func($param.'::all()')

$param is string from URL and representation my Model

all() is method

I get error:

call_user_func() expects parameter 1 to be a valid callback, class 'Brand' not found

P.S.

I include Brand class

use \App\Brand

Do you have solution how to call an object over a string?

via Chebli Mohamed