CodeIgniter中找不到错误类控制器

Question

您好,我Controller在CodeIgniter中找不到错误.这是我的控制器代码

<?php

class HelloWorld extends Controller
{

    function HelloWorld()
    {
        parent::Controller();
    }

    function index()
    {
        $this->load->view('index_view');
    }

    function hello()
    {
        $this->load->view('hello_view');
    }

}
?>

这是视图代码:

Hello, Nice to see you!

执行时出现此错误:

Fatal error: Class 'Controller' not found in D:\wamp\www\CodeIgniter_2.0.2\application\controllers\helloworld.php on line 2

谁能告诉我为什么会出现这个错误？

Answer 1

从CodeIgniter开始,2.x CI_前缀被添加到所有核心类.检查更改日志.

Added CI_ Prefix to all core classes.

对于CodeIgniter 2.x

<?php

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

class HelloWorld extends CI_Controller
{

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

    function index()
    {
        $this->load->view('index_view');
    }

    function hello()
    {
        $this->load->view('hello_view');
    }

}

对于CodeIgniter 1.x

<?php

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

class HelloWorld extends Controller
{

    function HelloWorld()
    {
        parent::Controller();
    }

    function index()
    {
        $this->load->view('index_view');
    }

    function hello()
    {
        $this->load->view('hello_view');
    }

}

希望这对你有所帮助.谢谢!!