Login Session PHP

< ?php
class login{

private $user = '';
private $pass = '';

/**
* login::__construct()
* @access public
*/
public function __construct(){
session_name('login');
session_start();
}

/**
* login::set_user()
* @access public
* @param string $user
* @return
*/
public function set_user($user){
$this->user = $user;
}

/**
* login::set_pass()
* @access public
* @param string $pass
* @return
*/
public function set_pass($pass){
$this->pass = $pass;
}

/**
* @access public
* @return bool
* @return redirect
*/
public function is_logged_in(){
if(isset($_SESSION['is_logged_in']) && $_SESSION['is_logged_in']== true){
return true;
}

return false;
}

/**
* Löscht Cookie und Session
* @access public
*/
public function do_logout(){
// Cookie clientseitig löschen
if (isset ($_COOKIE[session_name ()]))
{
setcookie (session_name (), '', time ()-42000, '/');
}
// Cookie serverseitig löschen
session_destroy ();
$_COOKIE = null;
$_SESSION = null;
}

/**
* Login function
* @access public
* @param string $user Bentuzername
* @param string $password Passwort
* @return bool
*/
public function do_login($user,$password){
if($user === $this->user && $password === $this->pass){
$_SESSION['is_logged_in'] = true;
return true;
}

$_SESSION['is_logged_in'] = false;
return false;
}
}
?>

< ?php
require_once "../classes/login.class.php";
$login = new login();
$login->set_user('admin');
$login->set_pass('admin');

if(isset($_GET['logout']) && $_GET['logout']==1){
$login->do_logout();
}

if(isset($_POST['user'])){
$login->do_login($_POST['user'],$_POST['pass']);
}

if($login->is_logged_in()== false){
echo 'logged out';
?>
< form action="" method="post" >
User: < input type="text" name="user" value="" / >< br / >
Pass: < input type="password" name="pass" value="" / >< br / >
< input type="submit" value="login" / >

< /form >
< ?php
}
else
{
echo 'logged in';
?>
< br / >< br / >< a href="?logout=1">Logout< /a >
< ?php
}
?>
< br />< br />< a href="">Reload page< /a >