How to define a global variable(value) in codeIgniter

Question

I simply do not mean how to define a global variable/constant in CodeIgniter. Let me explain: I have made a theme engine which is select-able from the current logged in user\'s

Answer 1

I got this from the manual and this what I have at the top of my config/config.php file: (i have a custom config set to paypal testing)

// HOW TO USE - For example if there's $config['foo'] = 'bar';
// in the config 
// using $this- >config->item('foo') will be 'bar'.

// example for my paypal testing: 
$config['paypaltest']=0;  

http://ellislab.com/codeigniter%20/user-guide/libraries/config.html

and how to access in a controller:

$paypaltest = $this->config->item('paypaltest');

Answer 2

Create A core controller, since your process requires logical operations then you need a method for that.

application/core/MY_Controller.php

class MY_Controller Extends CI_Controller
{

   protected $default_theme = 'theme';

   public function __construct()
   {
      parent::__construct();
   }

   public function get_theme()
   {
         //your code for selecting the current theme selected from
         //the database
         $theme_from_db = '';

         return $theme_from_db == NULL ? $this->default_theme : $theme_from_db;
   }
}

Your Controller must extend MY_Controller

application/controller/view.php

class view extends MY_Controller
{
   public function index()
   {
     $this->load->view($this->get_theme().'result', $data);
   }
}

Answer 3

in code igniter global constants can be defined in

config->constants.php

even you no need to load it,it automatically autoloaded by CI automatically.

Answer 4

In Codeigniter all constant is defined inside application/config/constant.php.
like: define("CONSTANTNAME","value");

Constant degined here is accessible throughout all pages, ie; controllers, models and views