<?php
   error_reporting(~0);

   class Schaltflaeche
   {
      private $command;


      /**
       * @param closure $command
       */
      function __construct($command)
      {
         //$this->command = Closure::bind($command, $this, get_class());
         $this->command = $command;
      }
      function click()
      {
         call_user_func($this->command);
      }
   }

   class VideoPlayer
   {
      function einschalten()
      {
         echo 'ein';
      }
      function ausschalten()
      {
         echo 'aus';
      }
   }


   $fEinschaltenCommand = 
      /**
       * @param VideoPlayer $oVideoPlayer
       * @return closure
       */
      function(VideoPlayer $oVideoPlayer)
      {
         return function() use ($oVideoPlayer)
         {
            $oVideoPlayer->einschalten();
         };
      };

   $fAusschaltenCommand = 
      /**
       * @param VideoPlayer $oVideoPlayer
       * @return closure
       */
      function(VideoPlayer $oVideoPlayer)
      {
         return function() use ($oVideoPlayer)
         {
            $oVideoPlayer->ausschalten();
         };
      };

   $oVideoPlayer = new VideoPlayer();
   $oSchaltflaecheEin = new Schaltflaeche($fEinschaltenCommand($oVideoPlayer));
   $oSchaltflaecheEin->click();
   $oSchaltflaecheAus = new Schaltflaeche($fAusschaltenCommand($oVideoPlayer));
   $oSchaltflaecheAus->click();
?>