accessibilty issue with codeigniter session library

Question

I'm working on user login system in codeigniter. When user clicks on login button the username and password are verified and the data is store in $this->session->set_userdata($arr); session library and the page redirects to home.php. Till here works fine but when is try to access the session in home.php as print_r($this->session->userdata);. it give me this errors

的颜色

这是Controller代码：Login.php

function login_user(){
    $login_btn = $this->input->post('login_btn');

    if($login_btn == TRUE){
        $arr['login'] = array(
            'username'=>$this->input->post('username'),
            'password'=>$this->input->post('password')
        );

        $query = $this->Login_model->users_login($arr);

        if($query->num_rows() > 0 && $query->num_rows() == 1){
            $this->load->library('session');
            $this->session->set_userdata($arr);
            redirect('Login/redirec_To_home','refresh');    
        }
        else
        {
            $this->index();
        }
    }
    else
    {
        $this->index();
    }
}

function redirec_To_home(){
    $this->load->view('login/home');
}

这是视图html文件名：path views / login / home.php

<?php
    print_r($this->session->userdata); //ERRORS SHOWN IN THIS LINE NUMBER : 13
?>

感谢提前

Answer 1

请转到项目目录中的application / config / autoload.php并搜索库，之后将会话添加到此行，如下所示。

$autoload['libraries'] = array('session');

Answer 2

在__construct区域中，您需要使用库中的get实例重新加载会话库

https://www.codeigniter.com/user_guide/general/ancillary_classes.html

https://www.codeigniter.com/user_guide/general/creating_libraries.html#utilizing-codeigniter-resources-within-your-library

class Example {

    protected $CI;

    // We'll use a constructor, as you can't directly call a function
    // from a property definition.
    public function __construct()
    {
            // Assign the CodeIgniter super-object
            $this->CI =& get_instance();
            $this->CI->load->library('session');
            $this->CI->load->model('login_model');
    }

    public function somefunction()
    {
         $this->CI->input->post('username');
         $this->CI->input->post('password');

         $user_model = $this->CI->login_model->user_login();

         $sesstion_data = array('user_id' => '1');

         $this->CI->session->set_userdata($sesstion_data);
    }
}