undefined function anchor()

Fatal error: Call to undefined function anchor() in C:\xampp\htdocs\CI202-CRUD\application\controllers\welcome.php on line 13

controllers/welcome.php

PHP Code:

class Welcome extends CI_Controller {
    function __construct()
    {
    //    parent::__construct();
    //    $this->load->helper(array('html','form', 'url'));
    }
    public function index()
    {
        $data = array(
            'title' => 'Welcome Profile Edit',
            'body' => anchor(base_url().'member_area/', 'Member area')
        );
        $this->load->view('_output_html', $data);
    } 


I already autoload the helper:

autoload.php

PHP Code:

$autoload['helper'] = array('html','url','form'); 


I wonder how to fix the error?

" If I looks more intelligence please increase my reputation."