当应用程序在托管中上载时，无法在codeigniter中设置会话user_data

Question

我在我的网络应用程序中遇到问题，我使用codeigniter 2.2.6，当我在localhost中运行时，应用程序工作应用程序工作正常，但当我上传到网络托管时，无法设置会话user_data。任何人都可以帮助和讨论我的问题？感谢

<?php

已定义（'BASEPATH'）或退出（'不允许直接访问脚本'）;

类Login扩展了CI_Controller {

function __construct(){
    parent::__construct();
    $this->load->helper('form');
    $this->load->library('form_validation');
    $this->load->library('session');

}



public function index(){

    if ($this->session->userdata('site_lang')=="") {
            $this->session->set_userdata('site_lang','english');
    }
    $this->form_validation->set_rules('username_login', 'Username', 'required');
    $this->form_validation->set_rules('password_login', 'Password', 'required');

    if ($this->form_validation->run()){

        //my code !
        $m_url = URL_API;
        $function = "login_user";
        $username_login = $this->input->post('username_login');
        $password_login = $this->input->post('password_login');

        $url = $m_url . "/" . $function . "?" ."u=". $username_login . "&" ."p=". md5($password_login);

        $json_data = file_get_contents($url);

        $data = json_decode($json_data);
        $status = $data->status;

        if ($data->status == "000"){

            $login= array (
            'session_username_login' => $data->username,
            'session_customer_id' => $data->customer_id,
            'session_customer_no' => $data->customer_no,
            'session_customer_name' => $data->customer_name,
            'session_customer_email' => $data->customer_email,
            'session_customer_gender' => $data->customer_gender,
            'session_customer_status' => $data->customer_status,
            'session_customer_handphone' => $data->customer_handphone,
            'session_customer_birthday' => $data->customer_birthday,
            'session_customer_address' => $data->customer_address,

            'session_password_login' => md5($password_login) );

            $this->session->set_userdata($login);
            $_SESSION['session_username_login'] = $data->username;

        }

        elseif ($status == "007") {

            $this->session->set_flashdata('msg','<div class="alert alert-danger text-center">'.lang('username_password_wrong').'</div>');
            redirect(MENU_LOGIN);
            }

        elseif ($status == "005") {

            $this->session->set_flashdata('msg','<div class="alert alert-danger text-center">'.lang('password_wrong').'</div>');
            redirect(MENU_LOGIN);
            }

        elseif ($status == "004") {

            $this->session->set_flashdata('msg','<div class="alert alert-danger text-center">'.lang('username_wrong').'</div>');
            redirect(MENU_LOGIN);
            }


    }

    if($this->session->userdata('session_password_login') != null){

        redirect(MENU_MARKETPLACE);
        exit;
    }

    }
    $this->load->view(MENU_LOGIN);
}

}