Codeigniter Parse error: syntax error, unexpected T_CLASS

I am trying a simple code igniter hello world tutorial but keep getting this error and don't know why.

Parse error: syntax error, unexpected T_CLASS in
C:\xampp\htdocs\loxxbylisa\application\controllers\helloworld.php on
line 3

<? php

    class HelloWorld extend CI_Controller {

    public function index(){
            $this->load->view('helloworld');
        }

    }

?>

I am running it in XAMPP and my helloworld.php in views folder is just the text "hello world".
Any suggestions?