/* testinterface_helper.php */

abstract class testInterface
{
	protected $m_oController = null;

	function __construct()
	{
		$this->m_oController = &get_instance();
	}

	abstract function run($pParam);
}

/* testclass_helper.php */

	class testClass extends testInterface
	{
		function __construct()
		{
			parent::__construct();
		}

		public function run($pParam)
		{
			print_r($this->m_oController);
			return "test";
		}
	}

$this->load->helper("/testcode/testclass");
$o = new testClass();
$pParam = array("param1" => "param");

$o->run($pParam);