An example of a library that uses config groups inside a CodeIgniter config file

CI_something.php

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

/*
 *defining a config with groups should look like
 *
 * $config['default']['hostname'] = '127.0.0.1'
 * $config['default']['port'] = '1234'
 *
 *the constructor should then be able to load it by either taking a group name 'default' always being the option without
 *a parameter, or just to take an array and use it as the expected array
 */
 
class CI_Something
{
	
	public function __construct($config = 'default')
	{
		$expected = array('arguement1', 'arguement2', 'arguement3')
		get_instance()->load->helper('array');
		
		if(is_string($config))
		{
			
			get_instance()->load->config('something');
			$config = elements($expected, get_instance()->config->item($config, 'something');
			
		} 
		else
		{
			
			$config = elements($expected, $config);
		}
		
		//do what you need with your config parameters
	}
}