<?php

class Session{
	private static $instance;

	private function __construct(){
		session_start();
	}

	public static function getInstance() {
		if (!isset(self::$instance)) {
			self::$instance = new Session();
		}
		return self::$instance;
	}

	public function setProperty( $key, $val ) {
		// don't need to check that session exists
		// since if we're here we must have instantiated
		// $instance and started the session
		$_SESSION[ $key ] = $val;
	}

	public function getProperty( $key ) {
		$returnValue = "";
		if (isset($_SESSION[$key])) {
			$returnValue = $_SESSION[$key];
		}
		return $returnValue;
	}
}

?>