I want to assign some value, to a variable `$user_detail` here, fetched from database to be used throughout the controller class, e.g user's detail. Its Laravel 5.3

```
private $user_detail;
public function __construct(){
    $this->user_detail=User::find(Auth::id());
}
public function index(){
    return $post_data=$this->user_detail;
}

```

From above code I get a blank screen.
How can I achieve this, or is there a better way to this? please suggest.
Thanks