Use Private member to hide information in PHP

/*w ww.  ja  va  2 s .  co  m*/
<?php
  class Widget
  {
    private $name;
    private $price;
    private $id;

    public function __construct($name, $price)
    {
      $this->name = $name;
      $this->price = floatval($price);
      $this->id = uniqid();
    }

    //checks if two widgets are the same
    public function equals($widget)
    {
      return(($this->name == $widget->name) AND
       ($this->price == $widget->price));
    }
  }

  $w1 = new Widget('Cog', 5.00);
  $w2 = new Widget('Cog', 5.00);
  $w3 = new Widget('Gear', 7.00);

  //TRUE
  if($w1->equals($w2))
  {
    print("w1 and w2 are the same<br>\n");
  }

  //FALSE
  if($w1->equals($w3))
  {
    print("w1 and w3 are the same<br>\n");
  }

  //FALSE, == includes id in comparison
  if($w1 == $w2)
  {
    print("w1 and w2 are the same<br>\n");
  }
?>