__unserialize() Method

The __unserialize() magic method is called when a script tries to construct an object from an associative array of key/value pairs.

<?php
     class WebPage {
             private $html;
             private $url;

         public function __construct($url) {
             $this->url = $url;
         }

             public function __serialize() {
                     return array('url' => $url);
             }

             public function __unserialize($arg) {
                     $this->url = $arg['url'];
                     $this->html = file_get_contents($this->url);
             }

     }
?>

Documentation

Related : Unserialization, Serialization, __serialize() Method