Codeigniter global variable problems

Question

I need to use codeigniter global variable, I don't want to create a variable for each controller page, I want to do as we put it in the header in php, but I couldn't find a solution.

Example variable $template;

Controller 1:

    class Auth extends CI_Controller{
        public function index (){
         $this->load->view($template.'Auth')
       }
    }

Controller 2:

    class Loader extends CI_Controller{
        public function index (){
         $this->load->view($template.'Auth')
       }
    }

Answer 1

//-create new file in:-//
/application/helpers/template_helper.php

<?php 
function admin_template() {
    return "admin/home";
}



//-From controller Auth-//

class Auth extends CI_Controller{
    function __construct(){
        parent::__construct();
        $this->load->helper('template');
    }
        public function index (){
         $data['info']="enter info here....";
         $this->load->view(admin_template().'Auth', $data)
       }
    }

can also auto load (template_helper.php): /application/config/autoload.php