display common data accross all pages

[eluser]DrDave[/eluser]
I too have been struggling with this for some time. I was finally able to get the variables available to all views using MY_Controller, but they are not available in any sub-controllers. There is one controller where I need to be able to make a modification to the categories. Is there a way to access this variable in that controller?


MY_Controller

Code:

class MY_Controller extends CI_Controller {

    public $view_data = array();

    public Function __construct()
    {
        parent::__construct();
        
        $this->load->model('site_data');
        $view_data['categories'] = $this->site_data->get_categories();
        $this->load->vars($view_data);
    }

}