Codeigniter - sessions not working through controller and view - php

Question

I'm trying to make a login using sessions in codeigniter at the time the username and password match, but I can't get it. I'm doing this:
Controller:
public function __construct()
{
parent::__construct();
$this->load->model('main_select');
$this->load->helper('url');
$this->load->library('session');
}
...code when username and password match:
if($pass === $user){
$this->session->set_userdata(array(
'user_id' => $login['id_user'],
));//we create the session 'user_id'
}
here it is supposed that we created a session called 'user_id'
in the view it doesn't work, I have this:
if( !$this->session->userdata('id_user') ){
//see this content
//first content
}else{
//see this other
//second content
}
but I always see the same content('second content').
trying to destroy it (but not working):
public function logout()
{
//session_unset();
// destroy the session
//session_destroy();
$this->session->unset_userdata('id_user');
header("Location: ".base_url() );
}
what am I doing wrong? thanks
EDIT1:
$password = md5( $this->input->post('inputpassword') );
$login = $this->login_select->get_username($username);
//si no coincide
if( $login['password'] !== $password ) {}

Answer 1

Note : Always use database to handle user logins. (Code is related to database login check)
in your database create table with user and add this 2 fields.
username
password
Add some user logins to it
Then in your code
public function __construct()
{
parent::__construct();
$this->load->model('main_select');
$this->load->helper('url');
$this->load->library('session');
}
// logging
public function loging()
{
$user = mysql_real_escape_string($_POST['username']);
$pass = md5(mysql_real_escape_string($_POST['password']));
$validate = $this->main_select->validate_user($user,$pass);
if(empty($validate) || $validate>1)
{
//Not a valid user
//redirect to login page
$this->load->view('loging');
}
else
{
//valid user
//set the session
$array = array('user_id' => '$user');
$this->session->set_userdata();
//redirect to normal page
$this->load->view('home_page');
}
}
//logout
public function logout()
{
$result= $this->session->sess_destroy();
if ((isset($result)))
{
header("Location: ".base_url() );
}
else
{
}
}
In Model
public function validate_user($user,$pass)
{
$query = $this->db->query("SELECT * FROM user WHERE username= '$user' AND password='$pass'");
$result = $query->result_array();
$count = count($result);
return $count;
}

Answer 2

modify this line of changes then your script will work as id_user need to set first to use in script.
if($pass === $login['password'] && $user===$login['username']){
$this->session->set_userdata(array(
'id_user' => $login['id_user'],
));//we create the session 'user_id'
}
here $login['password'] and $login['username'] are data come from tables and need to change fieldname pass or user according to your user table.