<?php
class Point
{  public function __construct($a,$b)
   {  $this->x=$a;  $this->y=$b;  }

   public function move($h,$v)
   {  $this->x+=$h;  $this->y+=$v;  }

   public function display()
   {  echo "($this->x, $this->y)";  }

   public function equal($p)
   {  return ($this->x == $p->x  && $this->y == $p->y ); }

   private $x, $y;
}

$p1=new Point(4,5);
$p1->display(); echo "\n";
$p1->move(2,2);
$p1->display(); echo "\n";

if ( $p1->equal($p2) ) echo "equal\n";
else echo "not equal\n";
?>