Soap to PHP API wrapper.

Please write a php script that will call the following SOAP API and then call the one function: "GetVehicleCollection" [login to view URL] Here is what I have now - not working so may only take 5 minutes to fix: <?php $soapClient = new SoapClient("[login to view URL]"); $sh_param = array( 'Username' => 'USERNAME', 'password' => 'PASSWORD' ); $headers = new SoapHeader('[login to view URL]', 'UserCredentials', $sh_param); $soapClient->__setSoapHeaders(array($headers)); $ap_param = array( ); $error = 0; try { $info = $soapClient->__call("GetVehicleCollection", array($ap_param)); print_r($soapClient); print_r($info); die; } catch (SoapFault $fault) { $error = 1; die("ERROR: ".$fault->faultcode."-".$fault->faultstring.". We will now take you back to our home page."); }