XMLRPC и MySql

<?php
if ($_SERVER['REQUEST_METHOD'] != 'POST' && isset($_GET['showSource']))
{
highlight_file(__FILE__);
die();
}
include("xmlrpc/xmlrpc.inc");
include("xmlrpc/xmlrpcs.inc");
class test{
function testString($m)
{
$s=$m->getParam(0);
return new xmlrpcresp(new xmlrpcval($s->scalarval()." RETURN FROM CLASSE!!!"));
}
}
 
function testt()
{
return new xmlrpcresp(new xmlrpcval(" RETURN FROM CLASSE!!!"));
}
 
 
$test_sig=array(array($xmlrpcString, $xmlrpcString));
function testString($m)
{
$s=$m->getParam(0);
return new xmlrpcresp(new xmlrpcval($s->scalarval()." RETURN!!!"));
}
 
function testDataBase($m)
{
 
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$db='xmlrpcserver';
 
// $connection = mysql_connect("localhost", "root", ""); 
//$conn = mysql_pconnect($dbhost,$dbuser,$dbpass);
 
return new xmlrpcresp(new xmlrpcval("1111"));
}
 
//======================= map ===================== 
 
$map=array(
"examples.testC" => array(
"function" => "test::testString",
"signature" => $testC_sig,
 
),
"examples.testString" => array(
"function" => "testString",
"signature" => $test_sig
),
"examples.testDataBase" => array(
"function" => "testDataBase",
"signature" => $testDataBase_sig
)
);
 
$s=new xmlrpc_server($map, false);
$s->setdebug(3);
$s->compress_response = true;
 
if (isset($_GET['RESPONSE_ENCODING']))
$s->response_charset_encoding = $_GET['RESPONSE_ENCODING'];
 
$s->service(); 
?>
 
Кліент отправляєт на сервер: 
 
<?xml version="1.0"?>
<methodCall>
<methodName>examples.testDataBase</methodName>
<params>
<param>
<value><string></string></value>
</param>
</params>
</methodCall>
 
А Сервер вазвращаєт :
XML error at line 1, check URLAn error occurred: 
Code: 2
Reason: 'Invalid return payload: enable debugging to examine incoming payload (XML error at line 1, check URL)'
 
Кагда комєнтую mysql_connect или mysql_pconnect то вазвращаєт нармальной ответ:
 
<methodResponse>
<params>
<param>
<value><string>1111</string></value>
</param>
</params>
</methodResponse>