communication with asmx webservices from php through SOAP extension

Question

I'm trying to communicate with a remote webservice, using the direction of some guides I found.

Unfortunately, my code gets -1 instead of the correct result. In this case the result should be result = 328000.

I tested with WCF test client

I don't know what to do next.

<?php
$soap = new SoapClient('http://www.auto1.cz/datalink/Landlord.asmx?WSDL');
// parameter 
$param=array("strVIN"=>"TMBJG9NEXH0060808");
$result=$soap->GetSellingPrice($param);
echo ($result->GetSellingPriceResult);
?>

Answer 1

Solved, problem was using double quotes (") instead single ones (')

... $param=array('strVIN'=>'TMBJG9NEXH0060808'); ...

Now it worsk properly.