Send user to 404 page if controller exists but method does not (add to MY_Controller.php)

method 404 catch

function _remap($method) {
	if (in_array(strtolower($method), array_map('strtolower', get_class_methods($this)))) {
		$uri = $this->uri->segment_array();
		unset($uri[1]);
		unset($uri[2]);
        	
		call_user_func_array(array($this, $method), $uri);
	}
	else {
		redirect('404');
	}
}