session_start();
$path = $_SESSION['path'];
........
function __construct($options = null, $initialize = true) {
$this->options = array(
'script_url' => $this->get_full_url().'/',
'upload_dir' => dirname($_SERVER['SCRIPT_FILENAME']).'/files/'.$_SESSION['path'].'/',
'upload_url' => $this->get_full_url().'/files/'.$_SESSION['path'].'/',