gistfile1.txt

<?php
class Injectable
{
  public function tomalaToda($argument)
  {
    return "Comete ". $argument;
  }
}

class Golosa
{
  public function damelaPapi($function)
  {
    echo $function("Esta");
  }
}

$injectable = new Injectable;
$golosa = new Golosa();
$golosa->damelaPapi([$injectable, 'tomalaToda']);