cannot access object user from another php page - php

Question

I'm trying to learn MVC pattern but,even if I'm trying hard, it seems I still got big issues.
I have got a controller,named baseController that do the following:
class baseController {
public $model;
public $user;
...
$activeuser = $this->model->getlogin();
if ($activeuser != 'invalid user' && $activeuser != "") {
$this->user=$activeuser;
header("Location:home.php");
}
I have got a model.php file which contains the getlogin() function:
public function getlogin() {
if (isset($_REQUEST['username']) && isset($_REQUEST['password'])) {
$username = mysql_real_escape_string($_REQUEST['username']);
$pwd = mysql_real_escape_string($_REQUEST['password']);
$pwd = md5($pwd);
$query = mysql_query("SELECT * FROM users WHERE username='$username' AND password ='$pwd' AND attivato =1;");
if (mysql_num_rows($query) == 1) {
require_once 'User.php';
$sql=mysql_fetch_array($query);
$activeuser = new User();
$activeuser->username=$sql['username'];
$activeuser->email=$sql['email'];
return $activeuser;
} else {
return 'invalid user'; //TO-DO
}
}
}
The home.php create a new homeController and calls its invoke() function.The homeController file include the view page,that's called afterlogin.php.
In the afterlogin.php I've got the "ERROR":
if (isset($activeuser)){
echo "<p>Utente ".$activeuser->username."</p>";
echo "<p>Email ".$activeuser->email."</p>";}
//echo "<p>Pass ".$activeuser->pwd."</p>";
echo"<h1> HOMEPAGE, LOGIN OK </h1>";
It seems the homeController,and so the afterlogin page cannot access the user created in the baseController file. If I try an echo inside the baseController of $this->user->username everything is working. What should I do?? HELP!!

Answer 1

The client-server lifecycle is effectively stateless; on every page load, your variables and objects are wiped out.
There are the client-sourced $_POST and $_GET superglobals, which is part of the standard form submission and url query processes.
The server has databases, file writing (sketchy from a security POV) and the $_SESSION superglobal. These are the ways the server can manage a data state between pageloads.
Understand that if you're using objects, you need to have them instantiated on every page load for them to work. You can store your user_ID in $_SESSION['user_ID'] and instantiate the user object from it every time, making appropriate changes according to how the data changes.