note 102412 added to function.httpresponse-getheader

HOW DO YOU USE THIS?
I tried:
<?php
$ip = HttpResponse:getHeader("http-x-forwarded-for");
echo $ip;
?>
I didn't work!
----
Server IP: 69.147.83.197
Probable Submitter: 99.108.140.105
----
Manual Page -- http://www.php.net/manual/en/function.httpresponse-getheader.php
Edit        -- https://master.php.net/note/edit/102412
Del: integrated  -- https://master.php.net/note/delete/102412/integrated
Del: useless     -- https://master.php.net/note/delete/102412/useless
Del: bad code    -- https://master.php.net/note/delete/102412/bad+code
Del: spam        -- https://master.php.net/note/delete/102412/spam
Del: non-english -- https://master.php.net/note/delete/102412/non-english
Del: in docs     -- https://master.php.net/note/delete/102412/in+docs
Del: other reasons-- https://master.php.net/note/delete/102412
Reject      -- https://master.php.net/note/reject/102412
Search      -- https://master.php.net/manage/user-notes.php