Laravel不是一个对象

Question

Im trying to use _construct in Laravel with bellow code

class SongsController extends Controller {

    private $song;

    public function _construct(Song $song){

        $this->song=$song;
    }
    public function index()
    {
        $songs=$this->song->get();
        return view('songs',compact('songs'));
    }
  }

but in line: $songs=$this->song->get(); i get an error: Call to a member function get() on a non-object. What i do wrong? Btw its run perfect if i do this:

public function index(Song $song)
    {
        $songs=$song->get();
        return view('songs',compact('songs'));
    }

Answer 1

As @Federico noted in the comments the proper syntax for php constructers is double underscore __ not _:

public function __construct(Song $song) {
    $this->song=$song;
}