Class 4 ajax request

<?php
## controller ##
class Ajax_request extends CI_Controller {
    public function index()
    {   /* Only for ajax request and result on JSON data */
        if($this->input->is_ajax_request()){
            ##... bla...bla... input by post / get methode ##
            $result=array("1"=>"hello","2"=>"world");
            # JSON result #
            $data['data']=json_encode($result);
            $this->load->view('ajax_result',$data);
        }
        else{
            $this->load->view('header');
            $this->load->view('notfound');
            $this->load->view('footer');
        }
    }
}
?>

<?php
## view ##
if(isset($data)){echo $data;}
else{echo "";}
?>