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separate php page

#1
in an entirely separate php that I have (test.php) in a folder above my xf installation I have the following code (which I found on this forum):
Code:
<?php

$startTime = microtime(true);
$fileDir = dirname(__FILE__);
$fileDir = $fileDir . '/community';

require($fileDir . '/library/XenForo/Autoloader.php');
XenForo_Autoloader::getInstance()->setupAutoloader($fileDir . '/library');

XenForo_Application::initialize($fileDir . '/library', $fileDir);
XenForo_Application::set('page_start_time', $startTime);

$visitor = XenForo_Visitor::getInstance();

$user_id = $visitor->getUserId();
$username = $visitor->get('username');
$email = $visitor->get('email');

echo "$user_id $username $email";
?>
it always returns 0 (zero) even though I am logged into the forum at /community/
I have also confirmed that the object(XenForo_Visitor) has the following:
Code:
["_user:protected"]=>
  array(40) {
    ["user_id"]=>
    int(0)
    ["username"]=>
    string(0) ""
can anyone help please?