NuSoap, XML was empty, couldn't parse - php

Question

First, I have to say that I am totally new to WSDL-based Web Services using NuSOAP. I am trying to return an array of friends list from my soap server. Please find below my code listings as is:
Server:
//File includes omitted
function getFriendList($test = ''){
$results = array();
$results[] = array('name' => 'XXXXA1', 'surname' => 'XXXXA2');
$results[] = array('name' => 'XXXXXB1', 'surname' => 'XXXXB2');
$results[] = array('name' => 'XXXXXC1', 'surname' => 'XXXXC2');
return $results;
}
//Create server instance
$server = new soap_server();
//Configure our WSDL
$server->configureWSDL('server', 'urn:server');
//Add our Complex Type data type since we want to return an array
$server->wsdl->addComplexType(
'Friend',
'complexType',
'struct',
'all',
'',
array(
'name' => array('name' => 'name', 'type' => 'xsd:string'),
'surname' => array('name' => 'surname', 'type' => 'xsd:string')
)
);
//Register our array as a response
$server->wsdl->addComplexType(
'FriendArray',
'complexType',
'array',
'',
'SOAP-ENC:Array',
array(),
array(
array('ref' => 'SOAP-ENC:arrayType', 'wsdl:arrayType' => 'tns:Friend[]')
),
'tns:Friend'
);
//Register the actual function that retuns the array but in the
//return n field specify the complex type of array we added onto the wsdl
$server->register('getFriendList',
array('test' => 'xsd:string'),
array('return' => 'tns:FriendArray'),
'urn:server',
'urn:server#getFriendList',
'document',
'encoded',
'Fetch a list of friends as an array. If you\'re not here sorry.'
);
//Serve the service
$server->service($HTTP_RAW_POST_DATA = (!isset($HTTP_RAW_POST_DATA)) ? $HTTP_RAW_POST_DATA : '');
With this, I hoped that I did everything correctly. I followed the standard procedure to make it work but in vein.
On the client side, I used the soap address url in wsdl and appended it with "?wsdl", so that it give me wsdl file dynamically.
example:
//Client call
$client = new nusoap_client("http://soapserver.dev/webroot/part_three/server.php?wsdl", true);
I have also taken labour of adding some whistles and bells on my client object as shown below:
$client->soap_defencoding = 'UTF-8';
$client->decode_utf8 = false;
This doesn't seem to help at all. I had experienced an issue earlier since my function accepts no parameter, where my service died because I didnt pass any parameter that speaks of inputs in my $client->call($name, $in, $out). I ended up providing an empty array and I got this error.
Could this be related to the rpc/document parameter types of the register function?
Even using the wsdl file which I saved from my server url, I got the same error.
Can somebody please help me out here? Please!