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Bug #24315 ob_gzhandler fails with with sessions and trans_sid
Submitted: 2003-06-24 07:55 UTC Modified: 2003-07-24 10:05 UTC
From: usenet0 at malkusch dot de Assigned:
Status: Closed Package: Session related
PHP Version: 4.3.2 OS: Linux
Private report: No CVE-ID: None
 [2003-06-24 07:55 UTC] usenet0 at malkusch dot de

When using the ob_gzhandler (and no output_buffering is set in .htaccess) and using Sessions it won't compress the output.

And this happens only when PHP needs to rewrite the output because of trans_sid.

In PHP 4.3.0 additionally the Error "Warning: (null)() [ref.outcontrol]: output handler 'ob_gzhandler' cannot be used twice in Unknown on line 0" occured.

Bye Markus Malkusch

Reproduce code:
if (!isset($_SESSION['i'])) {
	$_SESSION['i'] = 1;
} else {
echo 'i = '.$_SESSION['i'];
?><a href="bug.html">bug.html</a>

Expected result:
A compressed output to the browser even, when URIs are rewritten.

Actual result:
No compressed output, when PHP has to rewrite the URIs.


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 [2003-07-24 10:05 UTC]
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at
In case this was a documentation problem, the fix will show up soon at

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Thank you for the report, and for helping us make PHP better.

PHP now (latest stable CVS) reports the correct error message (ob_start(): output handler 'ob_gzhandler' cannot be used after 'URL-Rewriter') if you call ob_start('ob_gzhandler'); after session_start hs been called and trans_sid is used.
The solution is to call ob_start('ob_gzhandler'); before session_start().
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