Description:
------------
Hey,

I believe there is an incorrect (confusing) error message when ini_set('url_rewriter.tags', 0); is used after ob_start("ob_gzhandler");

Laters,
Lukian.

Reproduce code:
---------------
<?php // header.php
if (!isset($_SESSION)) session_start();
include_once('/home/nevyn/public_html/xhtml.php');
ini_set('url_rewriter.tags', 0);
/* ... more code ... */
?>

<?php // xhtml.php
error_reporting(E_ALL);
if (@strstr($_SERVER['HTTP_ACCEPT_ENCODING'], "gzip")) ob_start("ob_gzhandler");
/* ... more code ... */
?>

Expected result:
----------------
Warning: ob_start(): output handler 'ob_gzhandler' cannot be used if 'URL-Rewriter' has been executed after 'ob_gzhandler' was initialised in (file) on line (number)

or similar..
possible advising the user that the correct ordering is:

ini_set('url_rewriter.tags', 0);
ob_start("ob_gzhandler");

Actual result:
--------------
Warning: ob_start(): output handler 'ob_gzhandler' cannot be used after 'URL-Rewriter' in /home/nevyn/public_html/xhtml.php on line 3