如何在laravel 5.2中动态更改控制器中的模型查询？

This is my code

    $showid=3;
    $screenid='1';

    $seatdata=Screen1::all();

    $showtimedata=Showtime::where('showid',$showid)->get();
    $count =Showtime::where('showid',$showid)->count();

Now $showid and $screenid will be changing dynamically, there is no problem with showid it's working well, but whenever screen id changes then the model name written in the line below should change

    $seatdata=Screen1::all();

If say $screenid=2 then the code should become like

    $seatdata=Screen2::all();

If say $screenid=3 then the code should become like

   $seatdata=Screen3::all();

Note I have already created models Screen1, Screen2, & Screen3

I tried doing this but it didn't work

   $showid=3;
    $screenid='1';
    $screen='Screen'.$screenid;

    $seatdata=$screen::all();

    $showtimedata=Showtime::where('showid',$showid)->get();
    $count =Showtime::where('showid',$showid)->count();

This gives me error that

    FatalErrorException in SeatlayoutController.php line 27:Class 'Screen1' not found

Help is appreciated.

Try specify full namespace in your class, for example

$screen='App\Screen'.$screenid;