passing a forumid in phpinclude_start

[mike095]

in phpinclude_start (VB3.0.1), how can I push the forumid to an included php script?

Something like this:

ob_start();
$my_ad_path = "http://mydomain.com/ads/my_include_script.php?fid=".$forum[forumid];
include_once($my_ad_path);
$included_file = ob_get_contents();
ob_end_clean();