Objective-C ติดต่อกลับ Web Services Nusoap ทำยังไงหรือครับ

<?php

require_once("lib/nusoap.php");
require_once("DbManager.php");
require_once("DataManager.php");

    error_log("WS");

$namespace = "http://localhost:8888/test/Ws.php";$server = new soap_server();
$server->configureWSDL("test");
$server->wsdl->schemaTargetNamespace = $namespace;


$server->register(
                'PT_register', 	
                array('user'=>'xsd:string'),
                array('return'=>'xsd:string')
				);

$server->register(
                'PT_user', 	
                array('user'=>'xsd:string'),
                array('return'=>'xsd:string')
				);


function PT_register($user)
{	   
	$ws = new DataManager(); 
	$n =  $ws->register($user);
	return json_encode($n);
}
	
function PT_user($user)
{	   
	$ws = new DataManager(); 
	$n =  $ws->user($user);
	return json_encode($n);
}

$POST_DATA = isset($GLOBALS['HTTP_RAW_POST_DATA']) 
                ? $GLOBALS['HTTP_RAW_POST_DATA'] : '';

$server->service($POST_DATA);                
exit();

<?php

class DataManager extends DbManager
{

	function register($user) {

		try { 
			//$sql = 'INSERT INTO `user` VALUES ('.'"'.$user.'"'.')';
			//error_log($sql);
			//$rs =  $this->db->Execute($sql);
            error_log("in datamanager");
			return "00";
		} catch (Exception $e) { 
			return "99";
		}

	}

	function user($user) {

		try { 
			$sql = 'INSERT INTO `user` VALUES ('.'"'.$user.'"'.')';
			error_log($sql);
			$rs =  $this->db->Execute($sql);

			return "00";
		} catch (Exception $e) { 
			return "99";
		}

	}
}

_feeder = [[FeederModel alloc]
               initFromURLWithString:@"http://xxxxxx"
               completion:^(JSONModel *model, JSONModelError *err) {
                   
                   NSLog(@"in reloadFeed(), %@", [[_feeder names] objectAtIndex:0]);
                   
                   [[self tableView]reloadData];
               }];