php class auth var loggedIn function auth if isset _SESSION session_st

<?php

class auth
{
	var $loggedIn;

	function auth()
	{
		if(!isset($_SESSION))
		{
			session_start();
		}

		$this->loggedIn = (isset($_SESSION['loggedin']) && ($_SESSION['loggedin'] == '1'));
	}

	function login()
	{
		$this->loggedIn = true;
		$_SESSION['loggedin'] = '1';
	}

	function logout()
	{
		$this->loggedIn = false;
		unset($_SESSION['loggedin']);
	}

}

function println($str)
{
	echo $str."<br />\n";
}

$auth = new auth();
println(var_export($auth->loggedIn));

if(!isset($_GET['action']))
	exit();

if($_GET['action'] == 'in')
	$auth->login();
if($_GET['action'] == 'out')
	$auth->logout();

println(var_export($auth->loggedIn));


?>