Need help about php framework (codeigniter)

问题

I know php well. But I am a very new learner of php framework . I am learning codeigniter 2.0.3. I am trying to develop a simple hello world application.

I have tried this code..

class Hello extends Controller{
  function Hello(){
    parent::Controller();
  }
  function you(){
    $this->load->view("you_view");
  }

}

But unfortunately I am receiving this error ...

Fatal error: Class 'Controller' not found in C:\wamp\www\CodeIgniter\application\controllers\hello_world.php on line 7

回答1:

Should be:

class Hello extends CI_Controller{
  function __construct() {
    parent::__construct();
            /* use this only for setting default values, 
            loading helpers, models, ... */
    }
    function you() {
      $this->load->view("you_view");
    }
 }

回答2:

Controller should be CI_Controller, like this:

class Hello extends CI_Controller{

回答3:

CI_Controller not Controller on

class Hello extends Controller{

becomes

class Hello extends CI_Controller{

回答4:

Here more information , examples and user Guide. Check this

Change Controller to CI_Controller in your code

来源：https://stackoverflow.com/questions/9946565/need-help-about-php-framework-codeigniter