information-system/application/controllers/china_zodiac.php

<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class China_zodiac extends CI_Controller {

    function __construct() {
        parent::__construct();
    }

    public function index()
    {
        # code...
    }

    public function edit_zodiac($zodiac)
    {
        $this->load->view('zodiac_edit');
    }

}