PHP won't set session to TRUE - php

Question

I'm trying to create a login system but it doesn't seem to set "Session=true". Please help I'm stuck with this for too long now.
Session starts
Checked all my code
No PHP errors
and No database Errors
Login Page:
if($session->is_logged_in()) {
redirect_to("index.php");
}
if (isset($_POST['submit'])) { // Form has been submitted.
$user_name = trim($_POST['user_name']);
$password = trim($_POST['password']);
// Check database to see if username/password exist.
$found_user = User::authenticate($user_name, $password);
if ($found_user) {
$session->login($found_user);
redirect_to("index.php");
} else {
// username/password combo was not found in the database
$message = "Username/password combination incorrect.";
}
} else { // Form has not been submitted.
$user_name = "";
$password = "";
}
Session Class:
class Session {
private $logged_in=false;
public $user_id;
function __construct() {
session_start();
$this->check_login();
if($this->logged_in) {
// actions to take right away if user is logged in
} else {
// actions to take right away if user is not logged in
}
}
public function is_logged_in() {
return $this->logged_in;
}
public function login($user) {
// database should find user based on username/password
if($user){
$this->user_id = $_SESSION['user_id'] = $user->id;
$this->logged_in = true;
}
}
public function logout() {
unset($_SESSION['user_id']);
unset($this->user_id);
$this->logged_in = false;
}
private function check_login() {
if(isset($_SESSION['user_id'])) {
$this->user_id = $_SESSION['user_id'];
$this->logged_in = true;
} else {
unset($this->user_id);
$this->logged_in = false;
}
}
}
$session = new Session();
index page:
if (!$session->is_logged_in()) { redirect_to("login.php");
Authorize Method:
public static function authenticate($user_name="", $password="") {
global $database;
$user_name = $database->escape_value($user_name);
$password = $database->escape_value($password);
$sql="SELECT * FROM users WHERE user_name='{$user_name}' AND password ='{$password}' LIMIT 1";
$result_array = self::find_by_sql($sql);
return !empty($result_array) ? array_shift($result_array) : false;
}

Answer 1

Change your is_logged_in() function to:
public function is_logged_in() {
$this->check_login();
return $this->logged_in;
}
Otherwise is_logged_in() will always return false on each new request (such as redirecting between pages). By calling check_login() first, it will set the logged_in variable with the value (true or false, dependent on if $_SESSION['user_id'] is set.
EDIT:
I'm sorry, I've overlooked the line in the constructor where you already call $this->check_login();
Another thing is that the authenticate function returns an Array instead of an object. So, change the following:
$this->user_id = $_SESSION['user_id'] = $user->id;
To
$this->user_id = $_SESSION['user_id'] = $user['id'];

Answer 2

Finally I have found the solution to this.
Guess what? It wasn't my codes fault but it was my servers(WAMP 2) fault. So, I uninstalled WAMP 2 and updated to the newer version WAMP 2.5. Solved my problem and no more getting redirect to login page!