autoloader in CI

config.php

/*
| -------------------------------------------------------------------
|  Native Auto-load
| -------------------------------------------------------------------
| 
| Nothing to do with cnfig/autoload.php, this allows PHP autoload to work
| for base controllers and some third-party libraries.
|
*/
function __autoload($class)
{
	if((strpos($class, 'CI_') !== 0) && (strpos($class, 'MY_') !== 0))
	{
		switch($class)
		{			
			case 'CMS_Controller':		
				//include_once(SPARKPATH . 'cloudmanic-api/1.0.0/libraries/'. $class . EXT);
				include_once(APPPATH . 'third_party/sigcms/libraries/'. $class . EXT);	
			break;
			
			default:
				@include_once(APPPATH . 'core/'. $class . EXT);	
			break;
		}
	}
}