 <?php
   class Vektor{
       private $andmed=array();
       function __construct($ux, $uy, $uz=null){
	     array_push($this->andmed, $ux);
	     array_push($this->andmed, $uy);
		 if($uz!=null){
  	       array_push($this->andmed, $uy);		 
		 }
	   }
	   function kysiX(){
	     return $this->andmed[0];
	   }
	   function kysiY(){
	     return $this->andmed[1];
	   }
	   function liida($teine){
	      return new Vektor(
		      $this->kysiX()+$teine->kysiX(), $this->kysiY()+$teine->kysiY());
	   }
	   function vastandVektor(){
	      return new Vektor(-$this->kysiX(), -$this->kysiY());
	   }
   }
 ?>