php - SoapClient calling webservice -

i trying call soap based webservice. following wsdl webservice

<soapenv:envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:var="some_namespace">     <soapenv:header/>     <soapenv:body>         <var:someservicerequest name="xxx" school="yyy" format="pdf" sendername1="aaa" />     </soapenv:body> </soapenv:envelope> 

now have tried possibilities call webservice using soapclient class in php. getting 'invalid xml' in response.

following way seems obvious dont understand why not working:

$soapclient = new soapclient($this->getwsdlurl(), array('trace' =>true,                                                         'soap_version'   => soap_1_2,                                                        ));  $headerbody = array('usernametoken'=>array('username'=>'someusername',                                              password'=>'somepassword'));   $header = new soapheader('https://xxx/soapconnector','security',$headerbody); $soapclient->__setsoapheaders($header); $oresponse = $soapclient->someservice(array('name'=>'asd', 'school'=>'sdf','format'=>'asdf'));