Codeigniter需要从一个模块连接到另一个模块

我想从一个模块中的一个控制器连接到另一个模块中的另一个控制器。我想从我的登录模块到我的仪表板模块，并使用仪表板模块内的功能。从登录模块切换到仪表板模块。这是我的登录控制器和仪表板控制器。

class Login extends MX_Controller {
function index()
{
        $this->load->view('includes/header');
        $this->load->view('login_form');
        $this->load->view('includes/footer');       
}
function validate_credentials()
{       
        $this->load->model('membership_model');
        $query = $this->membership_model->validate();
        if($query) // if the user's credentials validated...
        {
                $data = array(
                        'username' => $this->input->post('username'),
                        'is_logged_in' => true
                );
                $this->session->set_userdata($data);
                redirect('login/site/members_area');
        }
        else  // incorrect username or password
        {
                $this->index();
        }
}   
function signup()
{
        //$data['main_content'] = 'signup_form';
        //$this->load->view('includes/template', $data);
        $this->load->view('includes/header');
        $this->load->view('signup_form');
        $this->load->view('includes/footer');
}
function create_member()
{
        $this->load->library('form_validation');
        // field name, error message, validation rules
        $this->form_validation->set_rules('first_name', 'Name', 'trim|required');
        $this->form_validation->set_rules('last_name', 'Last Name', 'trim|required');
        $this->form_validation->set_rules('email', 'Email', 'trim|required|valid_email|callback_check_if_email_exists');
        $this->form_validation->set_rules('username', 'Username', 'trim|required|min_length[4]|max_length[15]|callback_check_if_username_exists');
        $this->form_validation->set_rules('password', 'Password', 'trim|required|min_length[4]|max_length[32]');
        $this->form_validation->set_rules('password2', 'Password Confirmation', 'trim|required|matches[password]');

        if($this->form_validation->run() == FALSE) // didn't validate
        {
                $this->load->view('includes/header');
                $this->load->view('signup_form');
                $this->load->view('includes/footer');
        }
        else
        {           
                $this->load->model('membership_model');
                if($query = $this->membership_model->create_member())
                {
                        $data['account created'] = 'Your account has been created. <br /> <br /> You may now login';
                        $this->load->view('includes/header');
                        $this->load->view('signup_successful', $data);
                        $this->load->view('includes/footer');
                }
                else
                {
                        $this->load->view('includes/header');
                        $this->load->view('signup_form');
                        $this->load->view('includes/footer');   
                }
        }
}
        function check_if_username_exists($requested_username) 
{
        $this->load->model('membership_model');
        $username_available = $this->membership_model->check_if_username_exists($requested_username);
                if ($username_available) 
                {
                                return TRUE;
                }else{
                                return FALSE;
                }
}
function check_if_email_exists($requested_email) 
{
        $this->load->model('membership_model');
        $email_available= $this->membership_model->check_if_email_exists($requested_email);
                if ($email_available) 
                {
                                return TRUE;
                }else{
                                return FALSE;
                }
}

function logout()
{
        $this->session->sess_destroy();
        $this->index();
}
}

my second login controller

class Site extends MX_Controller {
public function __construct()
    {
    parent::__construct();
         $this->is_logged_in();
              $this->lang->load('login/login/', 'english');
     }
function members_area()
{
         $this->load->view('logged_in_area');
                       //$this->load->module('dashboard/dashboard');
                       //$this->load->view('home');
}

function is_logged_in()
{
                        $is_logged_in = $this->session->userdata('is_logged_in');
                        if(!isset($is_logged_in) || $is_logged_in != true)
                       {
                               echo 'You don''t have permission to access this page. <a href="../login">Login</a>'; 
                               die();       
                               //$this->load->view('login_form');
                       }        
}   
}

我的仪表板模块中的控制器有一个名为home的函数，我正在尝试连接和使用。和仪表板的家庭功能有一个连接到另一个模块，但我不能得到连接从登录到仪表板工作。此外，我的登录工作方式，我需要通过我的members_area函数连接到仪表板模块。非常感谢所有的帮助。