Call WSDL by PHP

Question

Hi All,

I need to call some webservice functions, I need my request will have format:

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://SureClose.com/Services/v1" xmlns:ns2="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"&gt;
 <SOAP-ENV:Header>
  <wsse:Security SOAP-ENV:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"&gt;
                 <wsse:UsernameToken>
                                  <wsse:Username>username</wsse:Username>
                                  <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText"&gt;password&lt;/wsse:Password&gt;
                                  <wsse:Nonce>E0IYJ2Y=</wsse:Nonce>
                                  <wsu:Created xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"&gt;2009-11-04T17:00:57Z&lt;/wsu:Created&gt;
                        </wsse:UsernameToken>
                </wsse:Security>
         </SOAP-ENV:Header>
         <SOAP-ENV:Body>
  <v1:FunctionName>
   <v1:request>
    <sur:param1>value1</sur:param1>
    <sur:param2>true</sur:param2>
   </v1:request>
  </v1:FunctionName>
 </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

So i coded:

$url = 'https://staging.sclintegrations.com/services.wsdl';
            $client = new SoapClient($url);

            $username = 'username';
            $password = 'pass';

            $timestamp = gmdate('Y-m-d\TH:i:s\Z');
            $nonce = mt_rand(); //A random word. The use of rand() may repeat the word if the server is very loaded.
            $passdigest = base64_encode(pack('H*',sha1(pack('H*',$nonce).pack('a*',$timestamp).pack('a*',$password))));
            $auth = '<wsse:Security SOAP-ENV:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"&gt;
                              <wsse:UsernameToken>
                                  <wsse:Username>'.$username.'</wsse:Username>
                                  <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText"&gt;'.$password.'&lt;/wsse:Password&gt;
                                  <wsse:Nonce>'.base64_encode(pack('H*',$nonce)).'</wsse:Nonce>
                                  <wsu:Created xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"&gt;'.$timestamp.'&lt;/wsu:Created&gt;
                           </wsse:UsernameToken>
                        </wsse:Security>';

            $authvalues = new SoapVar($auth, XSD_ANYXML); 
            $header = new SoapHeader("http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd", "Security", $authvalues, true);
            $client->__setSoapHeaders($header);

         //call functions
         $param= array('param1'=>'value1','param2'=>'value2');
            $resObj= $client->FunctionName($param);

but server always return null value and server error code, otherwise I try to use testing tool it return value with the same parameter and value.

Could you please give me some idea.

Thanks for your supporting.