CodeIgniter Unset A Signle Session Item In An Multidimensional Array - codeigniter

Question

On my User.php library in my login function I create admin sessions by
$create_session = array(
'is_logged' => true,
'user_id' => $row->user_id
);
$this->CI->session->set_userdata('admin', $create_session);
The issue is when I try to unset admin session data individually it does not unset the session I select.
Var Dump:
Array
(
[__ci_last_regenerate] => 1449906266
[admin] => Array
(
[is_logged] => 1
[user_id] => 1
)
)
Logout function on library:
Does not Unset: Preferred Way
public function logout() {
$user_data = $this->CI->session->userdata('admin');
unset($user_data['is_logged']);
unset($user_data['user_id']);
}
But when I use this way below it works
public function logout() {
$this->CI->session->unset_userdata('admin');
}
For some reason will not let me unset session data individually from an array in sessions.
Question How am I able to unset codeigniter session data individually that are in my admin session array?
Full User.php library
<?php
class User {
private $user_id;
private $username;
public function __construct() {
$this->CI =& get_instance();
$this->CI->load->library('session');
}
public function login() {
if ($this->validate_password() == true) {
$this->CI->db->select('*');
$this->CI->db->from($this->CI->db->dbprefix . 'user');
$this->CI->db->where('username', $this->CI->input->post('username'));
$query = $this->CI->db->get();
if ($query->num_rows() > 0) {
$row = $query->row();
$create_session = array(
'is_logged' => true,
'user_id' => $row->user_id
);
$this->CI->session->set_userdata('admin', $create_session);
$this->user_id = $row->user_id;
$this->user_group_id = $row->user_group_id;
$this->username = $row->username;
return true;
} else {
return false;
}
}
}
public function is_logged() {
$get_session = $this->CI->session->userdata('admin');
return $get_session['is_logged'];
}
public function logout() {
$user_data = $this->CI->session->userdata('admin');
unset($user_data['is_logged']);
unset($user_data['user_id']);
}
public function validate_password() {
if (password_verify($this->CI->input->post('password'), $this->stored_hash())) {
return true;
} else {
return false;
}
}
public function stored_hash() {
$this->CI->db->where('username', $this->CI->input->post('username'));
$query = $this->CI->db->get($this->CI->db->dbprefix . 'user');
if ($query->num_rows() > 0) {
$row = $query->row();
return $row->password;
} else {
return FALSE;
}
}
}
Note:
I have two lots of sessions one admin for back end and catalog for front end that's why in array.

Answer 1

Using unset() by itself will not remove the values from the CodeIgniter session. You would need to save those changes to the session using $this->CI->session->userdata('admin', $user_data) again.
For example:
<?php
$user_data = $this->CI->session->userdata('admin');
print_r($user_data);
// Shows: Array ( [is_logged] => 1 [user_id] => 123 )
unset($user_data['is_logged']);
unset($user_data['user_id']);
print_r($user_data);
// Shows: Array ( )
// Check what values are saved in the session:
print_r($this->CI->session->userdata('admin'));
// Shows: Array ( [is_logged] => 1 [user_id] => 123 )
// Save your changes to the session
$this->CI->session->set_userdata('admin', $user_data);
// Check what values are saved in the session (now that we've updated the session)
print_r($this->CI->session->userdata('admin'));
// Shows: Array ( )
So, you need to do the following steps to update arrays stored in your session:
Get values from session: $arr = userdata('userdata')
Remove value(s) from array: unset($arr['key'])
Save changes to session: set_userdata('userdata', $arr)
As a workaround, you may be able to edit the $_SESSION directly, bypassing the CodeIgniter's Session library:
unset($_SESSION['admin']['is_logged']);
unset($_SESSION['admin']['user_id']);
I wouldn't advise bypassing the Session library like this, but it might suit your purposes more than the steps I've listed above.

Answer 2

Thanks to #Kirk Beard for advice I have found way to use CodeIgniter session and unset individually data that is in side my admin array();
I create the admin multidimensional array session
$create_session = array(
'is_logged' => true,
'other_item' => 'something'
);
$this->session->set_userdata('admin', $create_session);
Then if you need to unset a single item in the admin array.
unset($this->session->userdata['admin']['is_logged']);
Works for me.
To get multidimensional array session.
echo $this->session->userdata['admin']['is_logged'];
Or
$userdata = $this->session->userdata('admin');
echo $userdata['user_id'];

Answer 3

Generate sessions as $this->CI->session->set_userdata($create_session); instead of $this->CI->session->set_userdata('admin',$create_session);
such as
$create_session = array(
'is_logged' => true,
'user_id' => $row->user_id
);
$this->CI->session->set_userdata($create_session);
Now unset by name even individually
$this->CI->session->unset_userdata('is_logged');
$this->CI->session->unset_userdata('user_id');