Description:
------------
Since Feb 2009, all php scripts in my server suddently and selectively produced an curious error message in php log as following:

[code]
[16-Apr-2009 22:03:00] PHP Fatal error:  Nesting level too deep - recursive dependency? in D:\websites\nameclub\include\common.inc.php on line 56
[/code]

This proplem continued even after I upgrade to the current 5.2.9 version.

After checking all those lines of code, I found some similarities of that issue. They always caused by preg_replace or preg_match: 

[code]
$boardurl = 'http://'.$_SERVER['HTTP_HOST'].preg_replace("/\/+(api|archiver|wap)?\/*$/i", '', substr($PHP_SELF, 0, strrpos($PHP_SELF, '/'))).'/';
[/code]

[code]
// $cip = 124.227.153.46 
preg_match("/[\d\.]{7,15}/", $cip, $cips);
[/code]

Another curious characteristic is that it dosen't happen always. Instead, it ran into this problem only at a 1/3 chance. Normally, after I refleshed the same page, it worked just fine. That is why I believe it should be reported as a bug. 

Btw, I could provide some help if one of you ever have this kind of problem. The way I 'fixed' it is uncomment the pcre.recursion_limit line

;pcre.recursion_limit=100000

I don't know why but it just fixed the issue perfectly for me.

Yes I search a lot by the 'Nesting level too deep' keywords, but found none of them related to pcre extension, which I believe that mine has connection with.


Reproduce code:
---------------
$boardurl = 'http://'.$_SERVER['HTTP_HOST'].preg_replace("/\/+(api|archiver|wap)?\/*$/i", '', substr($PHP_SELF, 0, strrpos($PHP_SELF, '/'))).'/';


...
// $cip = 124.227.153.46 
preg_match("/[\d\.]{7,15}/", $cip, $cips);


Expected result:
----------------
null