ID: 48994
Comment by: apinstein at mac dot com
Reported By: jflatnes at vt dot edu
Status: Assigned
Bug Type: Zlib Related
Operating System: Linux 2.6.29
PHP Version: 5.2.10
Assigned To: jani
New Comment:
I ran into this issue today as well... but I have more to add.
Using PHP 5.3 + zlib 1.2.3
I *cannot* get compression + headers. I can get no compression, or
compression
w/o headers, but never "working" compression+headers.
I have tried:
httpd.conf:
php_flag zlib.output_compression On
php_admin_flag zlib.output_compression On
-> zip + no headers
php_flag zlib.output_compression true
php_admin_flag zlib.output_compression true
-> not zipped
In app.php:
ini_set('zlib.output_compression', true);
ini_set('zlib.output_compression', "On");
-> not zipped
Previous Comments:
------------------------------------------------------------------------
[2009-07-21 22:50:56] [email protected]
There is something weird going on here, verified it now. Need to
investigate more tomorrow. To reproduce on command line:
# HTTP_ACCEPT_ENCODING=gzip gdb --arg php-cgi test.php
------------------------------------------------------------------------
[2009-07-21 19:03:10] jflatnes at vt dot edu
<?php var_dump(ini_set('zlib.output_compression', 'On')); ?>
Results in:
string(0) "" (meaning I had no previous setting for
zlib.output_compression, I believe)
---
I am coming to understand that the string 'On' doesn't behave the same
way in ini_set as in an ini file, as mentioned. The issue I see here is
that there are two options for zlib compression:
zlib.output_compression = false: no compression with no headers.
zlib.output_compression = true: compression with appropriate headers.
Passing a string to ini_set (other than the string '1') causes a third,
undocumented behavior:
zlib.output_compression = 'On': compression without the headers.
Those three states describe the behavior I'm seeing, and the third
state seems like a bug. If 'On' is an invalid setting, shouldn't the
compression simply not be activated? Am I thinking about this
correctly?)
------------------------------------------------------------------------
[2009-07-21 18:46:33] [email protected]
Try this too:
<?php
var_dump(ini_set('zlib.output_compression', 'On'));
?>
Also note that using "On" or "Off" or such with ini_set() does NOT work
like they do when used in php.ini.
------------------------------------------------------------------------
[2009-07-21 02:48:18] jflatnes at vt dot edu
Description:
------------
When the configuration option 'zlib.output_compression' is set to a
boolean value, output is compressed and the appropriate HTTP headers are
sent. When the option is set to a string like 'true' or 'On', the
output is compressed, but no headers are sent, causing browsers to fail
to interpret the output as compressed.
Reproduce code:
---------------
<?php
ini_set('zlib.output_compression', 'On');
echo 'hello, world';
?>
Expected result:
----------------
The output "hello, world" to be gzip/deflate compressed as appropriate
for Accept-Encoding, and the Content-Encoding and Vary HTTP headers to
be set.
Actual result:
--------------
Instead, the output is indeed gzip-compressed, but the Content-Encoding
and Vary headers are not set.
The actual text that the browser prints is:
������ÊHÍÉÉ×Q(Ï/ÊI���ÿÿ�:r«ÿ
���
Note, this works correctly with the an ini_set argument of the boolean
value true. The documentation claims that ini_set should take string
arguments, though. Even if a boolean/integer is required to activate
output compression, the behavior should either be "all on" or "all off".
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=48994&edit=1
