Show the users with most posts in laravel 5

I want to show Users with most post and thats what i'm do.. I try this in my AppServiceProvider.php:

view()->composer('questions.side2', function($view){
        $m = User::leftJoin('questions','users.id','=','questions.user_id')
            ->selectRaw('‌​us‌​er‌s​.*, count(questions.user_id) AS total')
            ->groupBy('users.id')
            ->orderBy('total','DESC')
            ->skip(0)
            ->take(5)
            ->get();

        $view->with('m', $users); 
    });

In My Side view :

@foreach($m as $user)

   

@endforeach

but i still have this error: Undefined variable: m (View: C:\wamp\www\qq\resources\views\questions\side.blade.php) (View: C:\wamp\www\qq\resources\views\questions\side.blade.php)

via Chebli Mohamed