Php CodeIgniter会话数据不工作

我在登录时创建了一个会话，但它既没有保存我存储在会话中的变量，也没有将它们带到其他页面：

控制器代码：

    function CheckDatabase($password) //This function is only run when password validation is correct.//
{
    $username = $this->input->post('Username'); //Sets the username as a $username.//
    $result = $this->User_model->Login($username, $password);

    if($result)
    {
        $sess_array = array();
        foreach($result as $row)
        {
            $sess_array = array( //Makes an array of the data to be stored in the session.//
            'UserID' => $row->UserID,
            'Username' => $row->Username
            );

            $this->session->set_userdata('logged_in', $sess_array); //Sets $sess_array as the session.//
        }

        return TRUE;
   }

    else //Ran if the username or password aren't matched in the CIUsers database. Returns error message.//
    {
        $this->form_validation->set_message('CheckDatabase', 'Invalid login details.');
        return false;
    }
}

同一控制器上的索引功能（应阻止用户返回登录屏幕，但不会）

主视图上的代码（登录后指向哪个浏览器）

我在显示会话数据时遇到以下错误：

消息：未定义变量：Username

文件名：views/Home\u view.php

电话号码：9

---

要检索会话变量，必须执行以下操作

 $username = $this->session->userdata['logged_in']['Username'];
 echo $username;

$newdata = array(
                    'user_id' => $rows->id,
                    'user_name' => $rows->name,
                    'user_image' => $rows->user_image,
                    'user_email' => $rows->email,
                    'logged_in' => TRUE,  
                    'user_type' => $rows->user_type
                );
            }
            $this->session->set_userdata($newdata);

---

您必须像这样从会话中检索它，然后才能使用：

$user = $this->session->userdata('logged_in');
$Username = $user['Username'];
$UserID = $user['UserID'];

像这样试试

 $username = $this->session->userdata['logged_in']['Username'];
 echo $username;

$newdata = array(
                    'user_id' => $rows->id,
                    'user_name' => $rows->name,
                    'user_image' => $rows->user_image,
                    'user_email' => $rows->email,
                    'logged_in' => TRUE,  
                    'user_type' => $rows->user_type
                );
            }
            $this->session->set_userdata($newdata);

并签入用于用户会话的控制器构造

<?php
    if (!defined('BASEPATH'))
        exit('No direct script access allowed');
    class User extends CI_Controller {
            public function __construct() {
            parent::__construct();

        //Here we will check for the session value if it is true then the function will run else it will redirect to login page

            if ($this->session->userdata('logged_in') == FALSE) {
                redirect(site_url('your login page'));
            } else {
              // if there is session value
              redirect(site_url('User/your function name');
            }
    }
}
    ?>

}

 if($result)
{
    $sess_array = array();
    foreach($result as $row)
    {
        $sess_array = array( //Makes an array of the data to be stored in the session.//
        'UserID' => $row[0]->UserID,
        'Username' => $row[0]->Username
        );

        $this->session->set_userdata('logged_in', $sess_array); //Sets $sess_array as the session.//
    }

    return TRUE;