Description:
------------
when you include a script from
site1 to site2
then $HTTP_HOST or $_SERVER["HTTP_HOST"]
whil give me site1 instead of site2
can it be a fix around to this?

Reproduce code:
---------------
site1: www.site1.com/script.php
<?php
echo $_SERVER["HTTP_HOST"];
?>

site2: www.site2.com/somting.php
<?php
include "www.site1.com/script.php";
?>

Expected result:
----------------
www.site2.com

Actual result:
--------------
www.site1.com