Accessing $vbulletin on a page called via AJAX

[Chunky Monkey]

Hello,

I want to add some ajax functionality to the UI that calls a custom php script and accesses $vbulletin and data managers to do different things depending on which button a user pushes from the UI.

The problem I'm having is that $vbulletin and other vBulletin related variables are not in scope on the php page the AJAX request hits, even when I include global.php on it.

Can anyone tell me what I would have to do to give php pages accessed via AJAX requests access to $vbulletin, etc.?

For starters, I would like the file, say myAjaxCalls.php, to do something as simple as this when the JavaScript hits it via AJAX and displays what the PHP page outputs:

PHP Code:

<?php
echo 'Hello ' . $vbulletin->userinfo['username'];
?>

$vbulletin does not appear to be in scope at the moment, even when I include global.php on the page so that myAjaxCalls.php looks like

PHP Code:

<?php
include 'global.php';
echo 'Hello ' . $vbulletin->userinfo['username'];
?>

Any help would be greatly appreciated!