不在页面之间携带的codeigniter会话

这里有人熟悉CodeIgniter会话吗？我有一个功能登录脚本 . 成功登录后，将创建会话 . 用户被重定向到他们的主页 . 新页面应显示存储在会话变量中的用户名，但根本不显示任何内容 .

登录脚本中的代码：

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

class Login extends CI_Controller {

    /**
     * Index Page for this controller.
     */
    public function index() {
        $this->load->library('session');
        $BB_DATA = array();
        if(isset($_POST['login'])) {
            // SELECT username, password FROM Bacon or bacon-like product. <-- Fuck you #nobanchancom
            if(!empty($_POST['username']) && !empty($_POST['password'])) {
                $q = sprintf('SELECT user_pk, username, pwhash, salt FROM tbl_user WHERE `username`=%s LIMIT 1;', $this->db->escape($_POST['username']));
                $records = $this->db->query($q);
                $username = $_POST['username']; // i added this
                if($records->num_rows() == 1) {
                    $record = $records->row();
                    $test_hash = hash_password($record->salt . $_POST['password']);
                    if($record->pwhash === $test_hash) {
                        $new_salt = generate_salt();
                        $new_hash = hash_password($new_salt . $_POST['password']);
                        $q = sprintf('UPDATE tbl_user SET `pwhash`="%s", `salt`="%s" WHERE `user_pk`="%s" LIMIT 1;', $new_hash, $new_salt, $record->user_pk);
                        if($updates = $this->db->query($q)) {
                            $BB_DATA['messages']['information'][] = "Login successful.";

                            //add custom data to session
                            $this->session->set_userdata('username', "$username");

                            //$this->session->set_userdata('some_name', 'some_value');
                            // redirect to /users/home/
                            redirect(site_url() . 'users/home/'); exit();
                        } else {
                            $BB_DATA['messages']['critical'][] = "You have logged in successfully, but an error has occurred during login.";
                        }
                    } else {
                        $BB_DATA['messages']['critical'][] = "That username/password does not match.";
                    }
                } else {
                    $BB_DATA['messages']['warning'][] = "That username/password does not exist.";
                }
            } else {
                $BB_DATA['messages']['warning'][] = "You must enter a username/password.";
            }
        }
        if(isset($_POST['register'])) {
            // Redirect to /register/
            redirect(site_url() . 'register/');
        }
        $this->load->view('login', $BB_DATA);
    }
}

/* End of file login.php */
/* Location: ./application/controllers/login.php */

然后这是用户登陆页面的代码：

<?php
class Users extends CI_Controller {

    public function home()
    {
        $this->session->userdata('username');
        require_once(APPPATH . 'views/header.inc.php');//header
            include(APPPATH . 'views/breadcrumbs.inc.php');//top breadcrumbs

            echo ' <h1>Welcome'.$username.',</h1>';
            //$username = $this->session->userdata('username');
            echo $this->session->all_userdata();
            //echo $username;
            include(APPPATH . 'views/breadcrumbs.inc.php');//bottom breadcrumbs
            require_once(APPPATH . 'views/footer.inc.php');//footer
    }



}

?>

在登录脚本中，我调用codeigniters会话库 -

$ this-> load-> library（'session'）;

稍后，假设一切正常，我将$ username变量添加到会话数据中 . 用户被重定向，并从那里

$ this-> session-> userdata（'username'）;应该重新 Build 变量 . 它不是 .

建议？

注意：因此，我使用 print_r(array_values($this->session->all_userdata())); 来打印数组中的所有值 . 它包含：

数组（[0] => 4c46f32b249ed55e8439152d63365fed [1] => 75.134.164.245 [2] => Mozilla / 5.0（Windows NT; Win64; x64; rv：26.0）Gecko / 20100101 Firefox / 26.0 Waterfox / 26.0 [3] = > 1410568024 [4] => [5] => ottomatic）

所以我很好奇，为什么把它添加为[5]而不是'用户名'？