How to check if the default configuration has been loaded in CI3? - php

Question

I am working in a custom library for a project to be used in CI3.1 (CodeIgniter 3.1). This is a piece of code:
class NavigationMenu
{
protected $CI;
public function __construct($params = ['config' => 'navigation'])
{
$this->CI =& get_instance();
$this->CI->load->helper('url');
$this->CI->config->load($params['config'], true);
$this->CI->load->model('nav_model', 'nav');
}
....
}
The default config 'navigation.php` file have the following code:
$config['navigation_open'] = '<ul class="nav">';
$config['navigation_close'] = '</ul>';
$config['item_open'] = '<li>';
$config['item_open_active_class'] = 'active';
As you can see I am loading the url helper, the navigation config file and the nav_model model. Is there any way to check if them has been loaded previously? Could be the case when I want to save time and then setup the autoload.php as follow:
$autoload['helper'] = ['url'];
$autoload['config'] = ['navigation'];
$autoload['model'] = ['nav_model'];
If that's the case how do I check if has been loaded in order to not try to load once again?
I have look over the documentation for config class and couldn't find anything helpful

Answer 1

You can check is any function from url helper available at the moment, so You'll be able to understand was helper loaded or You should do it by Yourself:
if(!function_exists('site_url'))
$this->CI->load->helper('url');
It's an easy trick if You need to check is any helper was loaded, but it's not too clear how to check is config/model loaded, so if You really want to create Your own autoloader, You need to do similar checks with the core object ($this->CI):
if(!method_exists($this->CI,'nav'))
$this->CI->load->model('nav_model', 'nav');