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Bug #61821 Using ob_start() + zlib.output_compression makes it impossible to flush output
Submitted: 2012-04-23 00:32 UTC Modified: 2012-04-24 18:03 UTC
From: Assigned: mike (profile)
Status: Not a bug Package: Zlib related
PHP Version: 5.4.0 OS: Linux
Private report: No CVE-ID: None
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 [2012-04-23 00:32 UTC]
When using ob_start() followed by a ini_set('zlib.output_compression', true), 
using ob_flush() won't output anything, even if no zlib compression will happen.

This is a new bug since PHP 5.4.0, maybe linked to #61820

Test script:


ini_set('zlib.output_compression', true);

echo "PHP VERSION ".phpversion()."\n";

echo "You shouldn't have to wait to see me\n";


Expected result:
PHP VERSION 5.5.0-dev
You shouldn't have to wait to see me

Actual result:
PHP VERSION 5.5.0-dev
You shouldn't have to wait to see me


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 [2012-04-23 09:00 UTC]
-Status: Open +Status: Assigned -Assigned To: +Assigned To: mike
 [2012-04-24 18:03 UTC]
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

The first output buffer is still there holding your output...?

Try print_r(ob_get_status(true));
 [2012-04-24 18:03 UTC]
-Status: Assigned +Status: Not a bug
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