CodeIgniter session is empty - codeigniter

Question

I set a session in a class from libraries. Then I tried to get the value of this session in another class from libraries. The value is empty.
I took a look in CodeIgniter Library to find out what the problem could be and at the some similar topics from StackOverflow but I don't see anything wrong from my end. maybe I am missing something. Please help.
// IN THIS CLASS I SET THE SESSION 'fr_phone'
class Form_submit_fr {
var $CI;
protected $fr_id;
protected $fr_data = array();
public function __construct() {
$this->CI =& get_instance();
if (strpos($this->CI->uri->segment(1),'frid') !== false){
$this->fr_id = (int)str_replace('frid','',$this->CI->uri->segment(1));
$this->fr_data = $this->get_fr_data();
// add the phone to session
if (isset($this->fr_data->city_toll) && $this->fr_data->city_toll != '') {
$fr_phone = $this->fr_data->city_toll;
} else {
$fr_phone = $this->fr_data->city_phone;
}
// here the session is set
$this->CI->session->set_userdata('fr_phone', $fr_phone);
//the result is correct
echo $this->CI->session->userdata('fr_phone') . ' - fr_phone<br>';
}
}
....
}
// IN THIS CLASS I NEED TO GET THIS SESSION 'fr_phone'
class P_details {
protected $page_link;
protected $fr_data;
var $CI;
public function __construct(){
$this->CI =& get_instance();
if ($this->CI->uri->segment(2) == false && $this->CI->uri->segment(3) == false) {
$this->page_link = $this->uri->segment(1)."/";
} else if ($this->CI->uri->segment(1) != false && $this->CI->uri->segment(2) != false && $this->CI->uri->segment(3) == false) {
$this->page_link = $this->CI->uri->segment(1)."/".$this->CI->uri->segment(2)."/";
} else if ($this->CI->uri->segment(1) != false && $this->CI->uri->segment(2) != false && $this->CI->uri->segment(3) != false) {
$this->page_link = $this->CI->uri->segment(1)."/".$this->CI->uri->segment(2)."/";
$this->fr_data = $this->get_fr_data($this->CI->uri->segment(3));
}
$this->CI->load->model('getDetails_model');
}
public function get_p_id($type = '') {
$details_array = $this->CI->getDetails_model->all_details($this->page_link);
if (empty($details_array)) {
return FALSE;
}
else {
$data['fr_phone'] = '';
$data['detail'] = $details_array;
// get phone from session
// here the session is empty
echo $this->CI->session->userdata('fr_phone') . ' - fr_phone<br>';
if ($this->CI->session->userdata('fr_phone')) {
$data['fr_phone'] = $this->CI->session->userdata('fr_phone');
}
if ($this->fr_data != '') {
$data['fr_detail'] = $this->fr_data;
}
return $data;
}
}
...
}
this is my config file:
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
$config['cookie_prefix'] = '';
$config['cookie_domain'] = '';
$config['cookie_path'] = '/';
$config['cookie_secure'] = FALSE;
$config['cookie_httponly'] = FALSE;
this is my autoload file:
$autoload['libraries'] = array('database','session');
I have made the suggested changes in config file for $config['sess_save_path']. thanks a lot. I could see the files in the writable folder and the entries in database when I checked this way as well:
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 43200;
$config['sess_save_path'] = APPPATH.'writable';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
Also I used database for session:
$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 43200;
$config['sess_save_path'] = 'ci_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
In both cases the session works if I define a session in Controller in constructor or index function. I can get session in View files and in other Classes but if I set a session under a condition for a specific link then this session is always empty when I want to get it in a class from libraries folder or in view files:
//in controller
if (strpos($this->uri->segment(1),'frid') !== false){
...
$fr_phone = '111-222-3333';
$this->session->set_userdata('fr_phone', $fr_phone);
echo $this->session->userdata('fr_phone') // works
}
When I call this session in a Class from libraries folder, the session is empty: above example for class P_details. And there is no way to get a session that is set in a Class from libraries folder and to get it in Another Class from libraries folder. It is very strange and I cannot get it. Also I tried to get session in a different controller and no success.

Answer 1

i had similar issue with one project. After long try i fix the issue the following way
1) in config.php
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = 'writable absolute path';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
and created the folder named "writable absolute path" in the root
Hopes this will help

Answer 2

It is very strange but I removed the session from autoload:
$autoload['libraries'] = array('database');
I added session_start(); in controllers and I set the session in a common way:
$_SESSION['fr_phone'] = $fr_phone;
Then I was able to get this value in any files. Is this a bug?
I tried without session_start() by adding $this->load->library('session'); and it did not work.
Can anyone find an answer to this issue?
I am using CodeIgniter 3.0.2