session userdata dont show admin value - codeigniter

Question

In database i have username, password, id, admin and etc. but my admin value not show. Why?
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// Get username
$username = $this->input->post('username');
// Get and encrypt the password
$password = md5($this->input->post('password'));
// Login user
$user_id = $this->user_model->login($username, $password);
if($user_id){
// Create session
$user_data = array(
'admin' => $admin,
'user_id' => $user_id,
'username' => $username,
'logged_in' => true
);
$this->session->set_userdata('logged_in', $user_data);
// Set message
$this->session->set_flashdata('user_loggedin', 'You are now logged in');
redirect('posts');
} else {
// Set message
$this->session->set_flashdata('login_failed', 'Login is invalid');
redirect('users/login');
}
}
}

Answer 1

Because you have set it like
$user_data = array(
'admin' => $admin,
'user_id' => $user_id,
'username' => $username,
'logged_in' => true
);
$this->session->set_userdata('logged_in', $user_data);
You can access it like on another controller.
$userdata = $this->session->userdata('logged_in');
echo $userdata['username'];
If you just need want to access like
echo $this->session->userdata('username');
Then you just need to set it like
$user_data = array(
'admin' => $admin,
'user_id' => $user_id,
'username' => $username,
'logged_in' => true
);
$this->session->set_userdata($user_data);
Make sure you have autoloaded session so can have access to it over website
config/autoload.php
$autoload['libraries'] = array('session');
On config.php make sure you have set the session path and session folder permission 0700
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = APPPATH . 'cache/session/';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

Answer 2

Thank you.
In model i found that:
// Log user in
public function login($username, $password){
// Validate
$this->db->where('username', $username);
$this->db->where('password', $password);
$result = $this->db->get('users');
if($result->num_rows() == 1){
return $result->row(0)->id;
} else {
return false;
}
}
i change to:
// Log user in
function login($username, $password){
$this->db->select('id,admin,username,password,email');
$this->db->from('users');
$this->db->where('username', $username);
$this->db->where('password', $password);
$query = $this->db->get();
if($query->num_rows()==1){
return $query->result();
} else{
return false;
}
}