SOAP CodeIgniter

<?php
require_once ('lib/nusoap.php');

//
//  MY_Model.php
//  Joint2
//
//  Created by Armando on 2012-09-27.
//  Copyright 2012 Armando. All rights reserved.
//

class MY_Model extends CI_Model {
    //Define Host
    private $host = 'localhost:8080';

    protected $WS;
    protected $nameSpace;
    protected $data;

    function __construct() {
        $this->data = new stdClass();
        parent::__construct();
    }

    public function call($operation, $params) {
        $client = new nusoap_client($this->WS);
        $err = $client->getError();

        if ($err) {
            echo '<h2>Constructor error</h2><pre>' . $err . '</pre>';
            exit;
        }
        return $client->call($operation, $params, $this->nameSpace);
    }

    protected function setWebService($ws) {
    //Sujeito a adaptação
        $this->WS = "http://" . $this->host . "/WS/" . $ws . "?wsdl";
    }

    protected function setNameSpace($nameSpace) {
    //Sujeito a adaptação
        $this->nameSpace = "http://" . $nameSpace . "/";
    }

    protected function getMainArray($array) {

        if($array == ""){
            return NULL;
        }

        $tmp = array();
        $key = array_keys($array);
        if (isset($array['title']) || is_string($key[0])){
            array_push($tmp, $array);
            return $tmp;
        }
        return $array;
    }
}

/************** Model ************/
<?php

//
//  projeto_model.php
//  Joint2
//
//  Created by Armando on 2012-09-27.
//  Copyright 2012 Armando. All rights reserved.
//
class eventos_model extends MY_Model {

    public function __construct() {
        parent::__construct();

        $this->setWebService('WSEvento');
        $this->setNameSpace('evento');
    }

    public function getAllEvents() {
    $this->data->someProperty = "somedata";
        return $this->getMainArray($this->call('retrieveAllEvent', (array) $this->data));
    }



/****** Controller ********/
<?php

/**
 * Description of eventos
 *
 * @author williams
 */
class eventos extends MY_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->model('eventos_model', 'Eventos');
    }

    public function index() {
        $this->data->result = $this->Eventos->getAllEvents();
        $this->load->view("eventos/eventos_view", (array) $this->data);
    }