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Bug #40441 mbstring function overloading turns on randomly
Submitted: 2007-02-12 08:48 UTC Modified: 2007-02-12 10:15 UTC
From: dmitry at rsl dot ru Assigned:
Status: Not a bug Package: mbstring related
PHP Version: 5.2.1 OS: linux
Private report: No CVE-ID: None
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 [2007-02-12 08:48 UTC] dmitry at rsl dot ru 
Description:
------------
Just like http://bugs.php.net/bug.php?id=39361 with exception that mbstring.func_overload is set to 2 globaly, but disabled for virtualhost. This leads mbstring function overloading to be enabled randomly.
Try to visit and then refresh http://www.projectharmony.ru/temp-images/q.php several times.
http://www.projectharmony.ru/temp-images/qq.php is the same script plus phpinfo();

Reproduce code:
---------------
<? if (strstr('','')) { } ?>

Expected result:
----------------
nothing expected

Actual result:
--------------
randomly:
Warning:  mb_strstr() [function.mb-strstr]: Empty delimiter. in q.php on line 1
-- or  --
nothing (as expected)
-- or  --
Warning:  strstr() [function.strstr]: Empty delimiter. in /home/html/www.projectharmony.ru/temp-images/q.php on line 1 (rare)

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 [2007-02-12 08:56 UTC] tony2001@php.net 
Not enough information was provided for us to be able
to handle this bug. Please re-read the instructions at
http://bugs.php.net/how-to-report.php

If you can provide more information, feel free to add it
to this bug and change the status back to "Open".

Thank you for your interest in PHP.
 [2007-02-12 09:13 UTC] dmitry at rsl dot ru 
how I can provide more information than phpinfo() at http://www.projectharmony.ru/temp-images/qq.php?
 [2007-02-12 09:21 UTC] tony2001@php.net 
Duplicate of bug #38670.
 [2007-02-12 09:46 UTC] dmitry at rsl dot ru 
I'm not sure that this is duplicate of bug #38670, since we not using safe mode at all. I think that this bug is a kind of http://bugs.php.net/bug.php?id=39361.

The problem is that mbstring.function_overload is set to 0 for apache's virtualhost (while mbstring.function_overload = 2 in php.ini), but strstr (and probably others) still overloaded, not always but randomly. No matter if strstr got overloaded or not, ini_get('mbstring.function_overload') is equal to 0 for this virtualhost.
 [2007-02-12 09:52 UTC] tony2001@php.net 
This Apache2-related problem is described in details in bug #38670. 

>since we not using safe mode at all
safe_mode is just an INI setting, as well as mbstring.func_overload.
 [2007-02-12 10:10 UTC] dmitry at rsl dot ru 
Does your answer mean that any php_value option in .htaccess could be randomly ignored by php when it is built as apache2 module?
 [2007-02-12 10:15 UTC] tony2001@php.net 
My answer means that if you set/unset INI values between virtualhosts, Apache may not reinitialize environment betwene requests.
 
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