title: DOCUMENT ROOT variable on PHP-IIS
body: <p>Does the <code>$_SERVER["DOCUMENT_ROOT"]</code> variable exist on IIS running PHP? Earlier I thought this variable is Apache specific and on IIS, you have to emulate it by string manipulation of <code>SCRIPT_NAME</code> and <code>SCRIPT_FILENAME</code> variables but I now see this variable on my PHP installation on IIS. Is it safe to assume that this variable will always be available on IIS.</p>