Controller main.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Main extends CI_Controller
{
    function __construct()
    {
        parent::__construct();
    }

    function index()
    {
        $data['session'] = $this->session->all_userdata();
        $this->load->view('admin/admin_view', $data);
    }
}