新手求助，连接数据库问题。
我刚刚开始学习，在这上面下载的分页的例子，总是报错。
Fatal error: Call to undefined function: base_url() in e:\pagination\system\application\controllers\books.php on line 15
程序如下：
<?php
class Books extends Controller {
function __construct() {
parent::Controller();
$this->load->helper('url');
$this->load->database();
}
function index() {
//load pagination class
$this->load->library('pagination');
$config['base_url'] = base_url().'index.php/books/index/';
$config['total_rows'] = $this->db->count_all('christian_books');
$config['per_page'] = '5';
$config['full_tag_open'] = '<p>';
$config['full_tag_close'] = '</p>';
$this->pagination->initialize($config);
//load the model and get results
$this->load->model('books_model');
$data['results'] = $this->books_model->get_books($config['per_page'],$this->uri->segment(3));
// load the HTML Table Class
$this->load->library('table');
$this->table->set_heading('ID', 'Title', 'Author', 'Description');
// load the view
$this->load->view('books_view', $data);
}
}
?>
config.php中是这样写的：
$config['base_url'] = "http://127.0.0.1/";
我访问的路径是：
[url]http://127.0.0.1/index.php/books/index/10[/url]
能告诉我什么原因么？急急急
