php soap client request - php

Question

How to send PHP SOAP Request to .NET Web Services, I have already tried soapclient(); class but something wrong..... any body please help me.
POST /KH/TestKH/WebServices.asmx HTTP/1.1
Host: www.host.com
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://tempuri.org/SearchMethod"
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<SearchMethod xmlns="http://tempuri.org/">
<_hap>string</_hap>
<_hapType>string</_hapType>
<UserID>string</UserID>
<Password>string</Password>
<Origin>string</Origin>
<Destination>string</Destination>
<FromDate>string</FromDate>
<ToDate>string</ToDate>
<Class>string</Class>
<Airlines>string</Airlines>
<Adults>int</Adults>
<Childs>int</Childs>
<Infants>int</Infants>
<isReturn>boolean</isReturn>
<CompanyCode>string</CompanyCode>
<sessionId>string</sessionId>
</SearchMethod>
</soap:Body>
</soap:Envelope>
OUR CODE:
$options["soap_version"]=SOAP_1_1;
$options["trace"]=true;
$options["exceptions"]=0;
$options["UserID"]="xxxxx";
$options["Password"]="xxxxx";
$client = new SoapClient("http://www.HOST.com/KH/TestKH/WebServices.asmx?WSDL",$options);
//var_dump($client->__getTypes());
$parameters= new stdClass();
$parameters->_hap="xxxxxxxxx";
$parameters->_hapType="TEST";
//$parameters->UserID="";
//$parameters->Password="";
$parameters->Origin="AUS";
$parameters->Destination="LHR";
$parameters->FromDate="01/01/2016";
$parameters->ToDate="27/02/2016";
$parameters->Class="X";
$parameters->Airlines="";
$parameters->Adults="1";
$parameters->Childs="0";
$parameters->Infants="0";
$parameters->isReturn=true;
$parameters->CompanyCode="xxxxx";
$parameters->sessionId="xxxxxx";
$result=$client->SearchMethod($parameters);
var_dump($result);
var_dump($client->__getLastRequest());
$status=$result->SearchMethodResult;
var_dump($status);
}
catch (Exception $e){
$e -> getMessage();
var_dump($e);
}
Our request process but don't know what is the wrong with these code because show server side error "Unknown error occured!"