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I can store the session but i cannot retrieve it , if i try to retrieve , it is just null .please help me here i have attached my coding

<?php

class Login extends CI_Controller{

function index(){
$data['main_content']='login_form';

$this->load->view('includes/templates',$data);
}

function validation(){

$this->load->model('membership_validation');
$result=$this->membership_validation->validation();

if($result){

$data[]=array(

'username' => $this->input->post('username'),
'log' => TRUE,
);

$this->session->set_userdata($data);

//echo $data->$username;

$name=$this->session->userdata('username');

$log=$this->session->userdata('log');

echo $log;//RESULT IS NULL
echo $h; // RESULT IS NULL

}

}

BUT I RETRIEVE ALL DATA like this it shows
like below
i can see that my session is stored
the output for

$this->session->all_userdata(); ,
Array ( [session_id] => 2b9b1c3cadf7cd7ff49
c6b576244d2dc [ip_address] => ::1 [user_agent] => Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0 [last_activity] => 1420380027 [user_data] => [0] => Array ( [username] => thamarai [log] => 1 ) )

$s=$this->session->userdata('session_id');

echo $s;// it is working it shows some id , but the session which i'm storing like username, log. i cant retrieve it

Code:
$data[] = array(

'username' => $this->input->post('username'),

'log' => TRUE,

);

This is the issue
you can do this:

Code:
$data['username'] =  $this->input->post('username');

$data['log'] = TRUE;

then u can access it like this :

Code:
$name = $this->session->userdata('username');

$log = $this->session->userdata('log');

or u can do this :

Code:
$data['user_info']=array(

'username' => $this->input->post('username'),

'log' => TRUE,

);

$user_info = $this->session->userdata('user_info');

$name = $user_info['username'];

and don't forget that session will be available on the next request(I mean you need to refresh page then display it,you can not display sessions right after seting it)

Thamaraiselvam

Mohammadhzp