php soapclient到xml请求

$client = new SoapClient(null, array(\'location\' => \"http://www.xxx.com/demo/webservice/wsHotel.sh\",\'uri\' => \"http://www.xxx.com/demo/\", \'encoding\' =>\"ISO-8859-9\"));

$parm[\'login\'] = \"UserName\";
$parm[\'pass\'] = \"Pass\";
$parm[\'agency_code\'] = \"AgencyCode\";
$parm[\'letters\'] = \"Germany\";
$inf = ($client->__soapCall(\"destinationListByLetterV2\",array($parm)));`

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 <soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:soapenc=\"http://schemas.xmlsoap.org/soap/encoding/\" 
 xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">
  <soap:Body soap:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">
  <ns1:destinationListByLetterV2 xmlns:ns1=\"urn:http://www.xxx.com/demo/\" SOAP-ENV:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">
  <params xmlns:ns2=\"http://schemas.xmlsoap.org/soap/encoding/\" xsi:type=\"ns2:Array\" ns2:arrayType=\"xsd:string[4]\">
  <item xsi:type=\"xsd:string\">UserName</item>
  <item xsi:type=\"xsd:string\">Pass</item>
  <item xsi:type=\"xsd:string\">AgencyCode</item>
  <item xsi:type=\"xsd:string\">Germany</item>
  </params>
  </ns1:destinationListByLetterV2>
 </soap:Body>
 </soap:Envelope>