serialize class

<?php
/***********************************************************
Serializeable class
Written By: Brad LaFountain ([email protected])

Simply extend this class from your base class
and any inherited classes will be able to be
serialized for use to write to file, to db, to cookie

Assumptions:
The class constructor for the inherited class
must take no parameters or must have default 
values for all of the parameters.

Examples:
class item extends serializeable
{
	var $_quanity;
	var $_item_ref;
	function item($item_ref = 0,$quanity = 0)
	{
		$this->_item_ref = $item_ref;
		$this->_quanity = $quanity;
	}
	function get_quanity()
	{
		return $this->_quanity;
	}
	function add_quanity($quanity)
	{
		$this->_quanity += $quanity;
	}
}

$item = new item(12345,"2");

$data = $item->serialize();
// do what ever you want with $data here
// for this example i'll just reuse it

$item2 = new item();
$item2->deserialize($data);
$item2->add_quanity(1);

echo $item2->get_quanity();

***********************************************************/

class serializeable
{
	function serialize()
	{
		$xmldoc = new_xmldoc("1.0");
		$root = $xmldoc->add_root(get_class($this));
		$this->_serialize_object($root,null,$this);
		return $xmldoc->dumpmem();
	}
	
	function deserialize($data)
	{
		$xmldoc = xmldoc($data);
		$root = $xmldoc->root();
		$this = $this->_deserialize_object($root);
	}
	
	// Deserialize Helpers
	function _deserialize_var($xmlobj)
	{
		$type = $xmlobj->getattr("type");
		switch($type)
		{
		case "simple":
			return $this->_deserialize_simple($xmlobj);
		break;
		case "array":
			return $this->_deserialize_array($xmlobj);
		break;
		case "object":
			return $this->_deserialize_object($xmlobj);
		break;
		}
	}
	function _deserialize_array($xmlobj)
	{
		$children = $xmlobj->children();
		foreach($children as $child)
		{
			$key = $child->getattr("key");
			$obj[$key] = $this->_deserialize_var($child);
		}
		return $obj;
	}
	function _deserialize_simple($xmlobj)
	{
		return $xmlobj->content;		
	}
	function _deserialize_object($xmlobj)
	{
		if(class_exists($xmlobj->name))
		{
			$obj = new $xmlobj->name;
			$children = $xmlobj->children();
			foreach($children as $child)
			{
				$name = $child->name;
				$obj->$name = $this->_deserialize_var($child);
			}
		}
		else
			echo $xmlobj->name . " is not a valid class";
		return $obj;
	}


	// Serialize Helpers
	function _serialize_object($xmlobj,$name,$var)
	{
		$members = get_object_vars($var);
		if(is_array($members))
		{
			if($name != null)
			{
				$child = $xmlobj->new_child($name,"");
				$child->setattr("type","object");
			}
			else
				$child = $xmlobj;
			$keys = array_keys($members);
			foreach($keys as $key)
			{
				$this->_serialize_var($child,$key,$members[$key]);
			}
		}
	}
	function _serialize_array($xmlobj,$name,$var)
	{
		$keys = array_keys($var);
		$child = $xmlobj->new_child($name,"");
		$child->setattr("type","array");
		foreach($keys as $key)
		{
			$this->_serialize_var($child,get_class($var[$key]),$var[$key]);
			$children = $child->children();
			$children[sizeof($children)-1]->setattr("key",$key);
		}
	}
	function _serialize_other($xmlobj,$name,$var)
	{
		$child = $xmlobj->new_child($name,$var);
		$child->setattr("type","simple");
	}
	function _serialize_var($xmlobj,$name,$var)
	{
		if(is_array($var))
		{
			$this->_serialize_array($xmlobj,$name,$var);
		}
		elseif(is_object($var))
		{
			$this->_serialize_object($xmlobj,$name,$var);
		}
		else
		{
			$this->_serialize_other($xmlobj,$name,$var);
		}
	}
}
?>