[wp-trac] [WordPress Trac] #22430: wp_ob_end_flush_all bug when zlib.output_compression = On

[WordPress Trac]

#22430: wp_ob_end_flush_all bug when zlib.output_compression = On
-----------------------------+--------------------------
 Reporter:  Matthias Reuter  |       Type:  defect (bug)
   Status:  new              |   Priority:  normal
Milestone:  Awaiting Review  |  Component:  General
  Version:  trunk            |   Severity:  major
 Keywords:  needs-patch      |
-----------------------------+--------------------------
 When zlib.output_compression is set to On, the function
 wp_ob_end_flush_all throws the following error:

 {{{
 Notice: ob_end_flush() [ref.outcontrol]: failed to delete buffer zlib
 output compression in /wp-includes/functions.php on line 2683
 }}}

 You can see this error e.g. when opening /wp-login.php in browser.

 Critical Issue related to this bug: it also affects usage of /wp-
 admin/customize.php - the preview results in a blank page. Seems that the
 error avoids ajax snippets from getting loaded succesfully.

 Hotfix is replacing in /wp-includes/functions.php

 {{{
 function wp_ob_end_flush_all() {
         $levels = ob_get_level();
         for ($i=0; $i<$levels; $i++)
                 ob_end_flush();
 }
 }}}

 with

 {{{
 function wp_ob_end_flush_all() {
         //$levels = ob_get_level();
         //for ($i=0; $i<$levels; $i++)
         //      ob_end_flush();
 }
 }}}

 This issue occurs in all browsers (ie,ff,opera, etc) with both latest
 versions of WordPress, 3.4.2 and latest nightly build on a LAMP system
 with PHP Version 5.3.10-1~dotdeb.0.

 PHP zlib settings:

 {{{
 Directive       Local Value     Master Value
 zlib.output_compression On      Off
 zlib.output_compression_level   5       -1
 zlib.output_handler     no value        no value
 }}}

-- 
Ticket URL: <http://core.trac.wordpress.org/ticket/22430>
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