accessibilty issue with codeigniter session library - php

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
Here is the Controller code : 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(){
$this->load->view('login/home');
}
Here is the view html file name : path views/login/home.php
<?php
print_r($this->session->userdata); //ERRORS SHOWN IN THIS LINE NUMBER : 13
?>
THANKS IN ADVANCE

Answer 1

Please go to application/config/autoload.php in your project directory and search libraries, after that add session to this line which will look like this.
$autoload['libraries'] = array('session');

Answer 2

In the __construct area you need to reload the session library using get instance in libraries
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);
}
}