abort_if.php

<?php

abort_if(! Auth::user()->isAdmin(), 403);
abort_if(! Auth::user()->isAdmin(), 403, 'Sorry, you are not an admin');
abort_if(Auth::user()->isCustomer(), 403);

// In "admin" specific controller
public function index()
{
    if (! Auth::user()->isAdmin()) {
        abort(403, 'Sorry, you are not an admin');
    }
}

// better!
public function index()
{
    abort_if(! Auth::user()->isAdmin(), 403);
}