How to consume WCF service in php that returns DataSet?

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PHP

WCFServices

Hi,
I have published WCF service which contains multiple methods that returns DataSet.
I have consumed this service in windows application working fine.
Now I would like to consume this wcf service in php application.
Below is the sample code for GetCancelledOrderList() method that accepts two parameters and returns the DataSet as a result.

$USERNAME_TEST = 'TESTAFF';
$PASSWORD_TEST = 'T@4S4%T';
$WSDL_TEST = "serviceurl?wsdl";

$client = new SoapClient($WSDL_TEST);
//print_r($client->__getFunctions());
$result =$client->GetCancelledOrderList(array('userName'=>$USERNAME_TEST, 'password'=>$PASSWORD_TEST));
var_dump($result);
print_r($result);
?>

I am not able to print response result that contains list order order number.
Please help me to sortout this issue.
Thanks in advance.