do notices support php or plugins? Its not working...

[doob]

I'm trying to use a php includes function OR a vbulletin plugin within a "notice" in the notice manager so I can write once and reuse a short code in multiple notices.

Something like this is NOT working:

<?php include("http://www.website.com/file.php"); ?>

Also tried this
<?php readfile('http://www.website.com/file.php'); ?>

Plugin code is not working either. I created something like this in the plugin manager:

ob_start();
include('../notices/notice.php');
$include_notice = ob_get_contents();
ob_end_clean();

And then placed this into the notice manager field but it did not work either:
$include_notice

Instead, that code just printed.

Is there some reason that notices don't support php or plugins or am I missing somthing?