How to save stdClass (result of SOAP function) to XML file?

I am trying to save result from SOAP function to XML file. I am calling SOAP function getProductListResult of web service http://public.ws.cz.elinkx.biz/service.asmx (description is available without logging).
I want save getProductListResult->ProductList to XML but it is stdClass and cant be converted to string and i got:
Catchable fatal error: Object of class stdClass could not be converted to string

I tried calling $data->getProductListResult->ProductList->any but didnt help (nor $data->getProductListResult->any)

thanks for help
$soap = new SoapClient(CONST_SOAP_EDSoapURL,
	array(  'style'    => SOAP_DOCUMENT,
                    'use'      => SOAP_LITERAL,
		    'trace' => true));
$data = $soap->getProductList(
	array(	'login' => CONST_SOAP_EDLogin,
			'password' => CONST_SOAP_EDPassword,  
			'onStock' => 'true')); //Products on store.	
$doc = new DOMDocument();
$doc->loadXML((string) $data->getProductListResult->ProductList);  // we get exception
$doc->save('_data/ceniky/cenikED.xml');

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Michal-DrozdAsked:
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apeterCommented:
You can serialize your object to xml from ur web service itself. See below link to see how to serialize
http://www.codeproject.com/KB/XML/xml_serializationasp.aspx
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Michal-DrozdAuthor Commented:
thanks for comment, but i need some tip how serialize in PHP, becouse in C# it is not helpful for me

I need to know how do it in PHP and use it in my PHP site
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apeterCommented:
0
Michal-DrozdAuthor Commented:
thanks, this url is about serializing objects in generally
I am searching for some class or function or another API to create XML from stdClass
There is PHP function get_object_vars($stdClass) to get members from stdClass and so its possible to create my own stdClass XML serializer, but it is what i didnt want to do

probably there is no general stdClass XML serializer so i will make my own
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