从会话代码点火器查看回显用户

我是新手。我实现了一个简单的登录系统。我想打印出一个用户名在我的视图页面，这是存储在会话。这是我的控制器

class LoginController extends CI_Controller {
function index(){           
        $new['main_content'] = 'loginView';
        $this->load->view('loginTemplate/template', $new); 
    }   
    function verifyUser(){          
        //getting parameters from view 
        $data = array(
                'username' => $this->input->post('username'),
                'password' => $this->input->post('password')
        );          
        $this->load->model('loginModel'); 
        $query = $this->loginModel->validate($data);   
              if ($query){             
            //if the user c validated
            //data variable is created becx we want to put username in session
                $data = array(
                    'username' => $this->input->post('username'),
                     'is_logged_in' => true 
                );
               $this->session->set_userdata($data);
             redirect('sessionController/dashboard_area');
        }
        else
         {
            $this->index();
        }
    }
    function logout()
    {
        $this->session->sess_destroy();
        $this->index();
    }
    }
    ?>

sessionController

<?php
          class SessionController extends CI_Controller {
function __construct()
{
    parent::__construct();
    $this->is_logged_in();
}

function dashboard_area(){

    $data['main_content'] = 'dashboardView';
    $this->load->view('dashboardTemplate/template', $data);
}
function is_logged_in()
{
    $is_logged_in = $this->session->userdata('is_logged_in');
    if(!isset($is_logged_in) || $is_logged_in != true)
    {
        echo 'You don''t have permission to access this page.';
        die();
        //$this->load->view('login_form');
    }else {
    return true;
    }
}

       }
  ?>

如何在会话中存储用户名，然后在页面中打印出来…我不想在每个控制器中都保存用户名

如果有人有更好的建议，请分享给我。