Get error in Nusoap: XML error parsing SOAP payload - php

Question

I'm new on Soap\NuSoap
I can connect to server site but from server send data back to client i can not get data in array to show client site. I have to test to get data and send data back to other database. I have to get in array.
it's show error
XML error parsing SOAP payload on line 2: Invalid document end
I can't fix it by myself. please help.
This is my client.php
include("lib/nusoap.php");
$client = new nusoap_client("http://192.168.20.3/soap_server/webservice.php?wsdl");
$client->soap_defencoding = 'utf-8';
$client->encode_utf8 = false;
$client->decode_utf8 = false;
$params = array(
'strName' => $_POST["strName"],
);
$result = $client->call("resultCustomer",$params);
$err = $client->getError();
if ($err) {
echo '<h2>Constructor error</h2><pre>' . $err . '</pre>';
echo '<h2>Debug</h2><pre>' . htmlspecialchars($client->getDebug(), ENT_QUOTES) . '</pre>';
exit();
}
print_r($result);
And this is server.php
require_once("lib/nusoap.php");
//Define our namespace
$namespace = "http://localhost/soap_server/webservice.php";
//Create a new soap server
$server = new soap_server();
//Configure our WSDL
$server->configureWSDL("getCustomer");
$server->wsdl->schemaTargetNamespace = $namespace;
$server->soap_defencoding = 'utf-8';
$server->encode_utf8 = false;
$server->decode_utf8 = false;
//Register our method and argument parameters
$varname = array(
'strName' => "xsd:string"
);
//Add ComplexType
$server->wsdl->addComplexType(
'ArrayOfString',
'complexType',
'array',
'',
'',
array(
'id_user' => array('name' => 'id_user', 'type' => 'xsd:string'),
'firstname' => array('name' => 'firstname', 'type' => 'xsd:string'),
'username' => array('name' => 'username', 'type' => 'xsd:string'),
'lastname' => array('name' => 'lastname', 'type' => 'xsd:string')
)
);
//Add ComplexType
$server->wsdl->addComplexType(
'ArrayOfString',
'complexType',
'array',
'',
'SOAP-ENC:Array',
array(),
array(
array('ref'=>'SOAP-ENC:arrayType','wsdl:arrayType'=>'tns:DataList[]')
),
'tns:DataList'
);
// Register service and method
$server->register('resultCustomer',$varname, array('return' => 'tns:ArrayOfString'));
function resultCustomer($strName)
{
$objConnect = mysql_connect("localhost","root","") or die(mysql_error());
$objDB = mysql_select_db("qpt-test");
$strSQL = "SELECT * FROM qpt_user where firstname like '%".$strName."%'";
$objQuery = mysql_query($strSQL) or die (mysql_error());
$intNumField = mysql_num_fields($objQuery);
$resultArray = array();
while($obResult = mysql_fetch_array($objQuery))
{
$arrCol = array();
for($i=0;$i<$intNumField;$i++)
{
$arrCol[mysql_field_name($objQuery,$i)] = $obResult[$i];
}
array_push($resultArray,$arrCol);
}
return $resultArray;
}
$POST_DATA = isset($GLOBALS['HTTP_RAW_POST_DATA']) ? $GLOBALS['HTTP_RAW_POST_DATA'] : '';
// pass our posted data (or nothing) to the soap service
$server->service($POST_DATA);
exit();