Codeigniter实现处理用户登录验证后的URL跳转

codeigniter处理用户登录验证后url跳转，主要涉及到了my_controller.php页面以及登录验证模块user.php页面，具体代码如下：

my_controller.php页面：

class my_controller extends ci_controller
{
    public function __construct()
    {
        parent::__construct();
        /*判断是否登录，判断当前url是否是auth/login*/
        if ( ! $this->tank_auth->is_logged_in()
                && ( $this->router->fetch_class() != 'auth' && $this->router->fetch_method() != 'login'))
        {
            $redirect = $this->uri->uri_string();

            if ( $_server['query_string'])
            {
                $redirect .= '?' . $_server['query_string'];
            }
            /*跳转到用户登陆页面，指定login后跳转的url*/
            redirect('auth/login?redirect='.$redirect);
        }   
    }
}

user.php页面：

class user extends my_controller
{
    function login()
    {

        if ($this->tank_auth->is_logged_in()) {                                    // logged in
            redirect('/');

        } else {
            //other codes here......
            /*判断是否有redirect信息*/
            $data['redirect'] = isset($_get['redirect']) ? $_get['redirect'] : '/';

            if ($this->form_validation->run()) {                                // validation ok
                if ($this->tank_auth->login(
                        $this->form_validation->set_value('login'),
                        $this->form_validation->set_value('password'),
                        $this->form_validation->set_value('remember'),
                        $data['login_by_username'],
                        $data['login_by_email'])) {                                // success
                    redirect($data['redirect']);

                } else {
                    //error handling
                }
            }
            $this->load->view("login_form")
        }
    }
/*
note: 在login_form中需要注意，提交表单的form地址：
<?php echo form_open(site_url("/auth/login?redirect=".$redirect)); ?>
*/
}

在login_form中需要注意，提交表单的form地址为：

<?php echo form_open(site_url("/auth/login?redirect=".$redirect)); ?>