<?php
require APPPATH . '/libraries/REST_Controller.php';
use Restserver\libraries\REST_Controller;
require APPPATH . 'libraries/Format.php';

/**
 * This is an example of a few basic user interaction methods you could use
 * all done with a hardcoded array
 *
 * @package         CodeIgniter
 * @subpackage      Rest Server
 * @category        Controller
 * @author          Phil Sturgeon, Chris Kacerguis
 * @license         MIT
 * @link            https://github.com/chriskacerguis/codeigniter-restserver
 */
class barang extends REST_Controller{
function __construct($config ='rest'){
        parent::__construct($config);
        header('Content-Type: application/json');
        $this->load->library('form_validation');

    }
}
<?php