class Pies { 
   public function slinic_sie() { 
      echo "Sluuuuup\n"; 
   } 
} 
class Kot { } 
function slinienie(Pies $pewny_pies) { 
   $pewny_pies->slinic_sie(); 
} 
$poppy = new Kot(); 
slinienie($poppy); 
