Edit report at http://bugs.php.net/bug.php?id=53099&edit=1
ID: 53099
User updated by: phpnet at rcpt dot at
Reported by: phpnet at rcpt dot at
Summary: mb_ereg_replace uses 100% cpu and takes >10 minutes
to execute.
Status: Open
Type: Bug
Package: mbstring related
Operating System: Ubuntu 9.10
PHP Version: 5.3.3
Block user comment: N
New Comment:
Thanks felipe, sorry about that; to avoid confusion, I mean
'mb_ereg_replace' not 'ereg_replace'.
Previous Comments:
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[2010-10-18 22:32:40] [email protected]
s/ereg_replace/mb_ereg_replace/g :)
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[2010-10-18 17:28:09] phpnet at rcpt dot at
Description:
------------
I have written a mb_trim function in php which uses ereg_replace to trim
strings in the same manner as trim() does.
The function is available at http://php.net/manual/en/ref.mbstring.php
Under the heading 'phpnet at rcpt dot at - 19-Aug-2010 02:46'
Using the string excerpt from our production environment
(http://pastebin.com/wmyjPmBV), ereg_replace appears to enter some sort
of recursive loop, in my environment it takes 100% cpu for 20 minutes
before finally returning the correct result.
When the section which reads: array( "\s","\t","\n","\r", "\0", "\x0B"
)
...is changed to array( "\s", "\0", "\x0B" ) then ereg_replace returns
promptly with the correct result.
Test script:
---------------
The function is available at http://php.net/manual/en/ref.mbstring.php
Under the heading 'phpnet at rcpt dot at - 19-Aug-2010 02:46'
It is also available here:
http://pastebin.com/CCpaVXay
The (serialized) string that causes the problem is:
s:488:"<I>Swans </I>
Wisely moving from the middle
of July to the middle of autumn, this indoor, forward-thinking
avant-rock weekend brings together all sorts of fiercely experimental
noisemakers, from psychedelic-folk to death metal, with a hotly
anticipated headline set from Michael Gira's New York noise inspiration
Swans. Don't expect many stony-faced rock nerds, though. The organisers
serve tea and cake throughout and they're promising other fun and games
this year.";
It is also available for download here:
http://pastebin.com/wmyjPmBV
You can execute the script with the following syntax:
<?php mb_trim( $string );
Expected result:
----------------
PHP will return the correct result quickly.
Actual result:
--------------
PHP will run at 100% CPU for 20 minutes.
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Edit this bug report at http://bugs.php.net/bug.php?id=53099&edit=1
