php's $_SERVER-array is empty if I am using vBSEO - how can I get these values?

I tried to insert a new plugin in the "global_start"-hook-location in vBulletin and inserted the following code:

PHP Code:

echo $_SERVER['REQUEST_URI']; 


This works fine if I am opening the forum startpage in my browser - I can see the current url displayed as first line of my website.
But if I am trying to get the $_SERVER['REQUEST_URI'] value on forumdisplay-pages or member-pages, the whole $_SERVER-array seems to be empty. I guess that this is an vBSEO-issue because the problems appears on all pages that have a "virtual" subfolder (/memberlist, /members, /forumname etc).
Can you tell me how I can get the current url or other values from PHP's $_SERVER-array on these pages? I also tried to use PHP's getenv()-function but this also returns empty strings.

try
$_SERVER['SCRIPT_NAME']

Like I said:
- $_SERVER['REQUEST_URI'] is empty
- $_SERVER is empty
- print_r($_SERVER) returns an empty array
- and this also implies that $_SERVER['SCRIPT_NAME'] is empty...

i think it's a hook location problem.

i can't get it to print in global-start, but it prints fine on forumhome complete

Do you actually read what I am writing? I already wrote in my first post that it is working fine on forumhome. The only problem is that $_SERVER is empty on pages with a virtual "subdirectory" inserted by vBSEO:
/members/blah.html
/members/list/blubb.html
/forumname/threadname.html
etc.
And it is not a problem with the global_start hook-location because I know for sure that globa_start is being executed on every vbulletin page. If i write
echo "test";
into the global_start-plugin instead of
echo $SERVER['whatever']
the string "test" appears on every vbulletin page, even the "vbSEOed" pages. The only issue is that the $SERVER-array is empty on vbSEOed pages whose URLs contain a virtual subdirectory.

I was able to solve the problem. vbSEO offers a global constant called VBSEO_REQURL_FULL and this constant also contains the full url including all parameters.

try $_SERVER['VBSEO_URI']