} else {
            header("Location : http://www.google.com");
        }
        mysql_close($conn);
    }
}
//isset($var) :  Determine if a variable is set and is not NULL.If a variable has been unset with unset(), it will no longer be set.
//$_GET : An associative array of variables passed to the current script via the URL parameters.
if (isset($_GET['operation'])) {
    // $fs /var/www/test/aqfaridi/
    $fs = new fs(dirname(__FILE__) . DIRECTORY_SEPARATOR . 'users' . DIRECTORY_SEPARATOR . 'guest' . DIRECTORY_SEPARATOR);
    try {
        $rslt = null;
        switch ($_GET['operation']) {
            case 'getname':
                $rslt = $fs->getname();
                break;
            case 'get_node':
                $node = isset($_GET['id']) && $_GET['id'] !== '#' ? $_GET['id'] : '/';
                $rslt = $fs->lst($node, isset($_GET['id']) && $_GET['id'] === '#');
                break;
            case "get_content":
                $node = isset($_GET['id']) && $_GET['id'] !== '#' ? $_GET['id'] : '/';
                $rslt = $fs->data($node);
                break;
            case 'save_node':
                $node = isset($_GET['id']) && $_GET['id'] !== '#' ? $_GET['id'] : '/';
                $rslt = $fs->save($node, isset($_GET['sdata']) ? $_GET['sdata'] : '');
                break;
            case 'temp_node':
                $ext = $_GET['ext'];