PHP SOAP client returns empty response from Web Service

Hi,

I have developed a small web service that takes two arguments and then it performs an XSLT transformation over XML and should return the result to a client which will just display it for the mean while. Although the two arguments are passed successfully to the service but the service returns nil instead of the intended response. I can't see what is the problem!

I know that the XSLT and XML files work properly since I have tested them so many times, and I'm pretty sure the client is fine as well, there is something in the service's code that I don't know why it isn't working as it should!


Here is first my client:
<?php
require_once('nusoap.php');

$wsdl="http:/myserver/AFS/AFS3.php?wsdl";
$client=new soapclient($wsdl, 'wsdl');

$Level="Advanced";
$LP="AL.xml";

$param=array("Level"=>$Level,"LP"=>$LP);

$result=$client->call('Get_Chunks_names', $param);
echo $result;

//for debugging
//Display the request and response
echo '<h2>Request</h2>';
echo '<pre>' . htmlspecialchars($client->request, ENT_QUOTES) . '</pre>';
echo '<h2>Response</h2>';
echo '<pre>' . htmlspecialchars($client->response, ENT_QUOTES) . '</pre>';
echo '<h2>Error Message</h2>';
echo '<pre>' . htmlspecialchars($client->debug_str, ENT_QUOTES) . '</pre>';

?>

Here is my service:

<?php
/**
 * Gets the level and LP location (via Aggregator Service AGS.php)
 * Reads the specific LP to extract the chunks (AL.xml or Java.xml)
 * Sends the Chunks names back to the AGS
 *
 *

 */
 
//Including NuSOAP library
require_once("nusoap.php");

//Defining the namespace for this service (a Distinct URI)
$ns="my server/AFS/AFS_nusoap";

//Instantiating the SOAP server and defining the settings for our WSDL file
$server = new soap_server();
$server->configureWSDL('AdaptionFilterService',$ns);
$server->wsdl->schemaTargetNamespace=$ns;

/** Registering our PHP functions, making the server "aware" of the existence of
*   those method and the values that will pass to and from the method.
*   Different methods are registered independently
*/

$server->register('Get_Chunks_names',
array('Level' =>'xsd:string',"LP"=>'xsd:string'), array('return' => 'xsd:string'),$ns);

function Get_Chunks_names($Level,$LP)
{
      $XSLFile = 'AFS6.xsl';
      $XMLFile = $LP;
      $xsl_params=array('Level'=>$level);
      function XSL_transformation($XMLFile,$XSLFile,$ResultFile,$xsl_params)
       {
      
            $Str = '';

            $xp = xslt_create() or trigger_error('Could not create XSLT process.',E_USER_ERROR);

            xslt_set_encoding($xp, 'ISO-8859-1');

            // read the files into memory
            $xsl_string = join('', file($XSLFile));
            $xml_string = join('', file($XMLFile));

            // set the argument buffer
            $arg_buffer = array('/xml' => $xml_string, '/xsl' => $xsl_string);

            // process the two files to get the desired output
            
                  $Str = xslt_process($xp, 'arg:/xml', 'arg:/xsl', NULL,$arg_buffer, $xsl_params);
                  

                  Saves transformation result into '$ResultFile'
                   $fp = fopen($ResultFile,"w+");
                   fwrite($fp,$Str);
                   fclose($fp);
            
                  
      
               //Free XSLT processor
               xslt_free($xh);

                   return new soapval('return','xsd:string',$ResultFile);
            

       
       
       }//end function2
   } //end of function1

//Invoking the Service
$server->service($HTTP_RAW_POST_DATA);



?>
 

Below is the request and response from soap client:


Request

POST /AFS/AFS3.php HTTP/1.0
Host: bubba.cs.nott.ac.uk
User-Agent: NuSOAP/0.7.2 (1.94)
Content-Type: text/xml; charset=ISO-8859-1
SOAPAction: "http://bubba.cs.nott.ac.uk/AFS/AFS3.php/Get_Chunks_names"
Content-Length: 663

<?xml version="1.0" encoding="ISO-8859-1"?><SOAP-ENV:Envelope SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:tns="http://bubba.cs.nott.ac.uk/AFS/AFS_nusoap"><SOAP-ENV:Body><tns:Get_Chunks_names xmlns:tns="http://bubba.cs.nott.ac.uk/AFS/AFS_nusoap"><Level xsi:type="xsd:string">Advanced</Level><LP xsi:type="xsd:string">http://bubba.cs.nott.ac.uk/LPS/AL.xml</LP></tns:Get_Chunks_names></SOAP-ENV:Body></SOAP-ENV:Envelope>



Response


HTTP/1.1 200 OK
Date: Thu, 08 Nov 2007 15:36:20 GMT
Server: Apache/2.0.52 (CentOS)
X-Powered-By: PHP/4.4.7
X-SOAP-Server: NuSOAP/0.7.2 (1.94)
Content-Length: 558
Connection: close
Content-Type: text/xml; charset=ISO-8859-1

<?xml version="1.0" encoding="ISO-8859-1"?><SOAP-ENV:Envelope SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><ns1:Get_Chunks_namesResponse xmlns:ns1="http://bubba.cs.nott.ac.uk/AFS/AFS_nusoap"><return xsi:nil="true" xsi:type="xsd:string"/></ns1:Get_Chunks_namesResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>



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