#43117 [Opn->Fbk]: using preg_replace count parameter (in wiki) causes total server meltdown

ID: 43117 Updated by: scottmac@php.net Reported By: commentgg at hotmail dot com -Status: Open +Status: Feedback Bug Type: Reproducible crash Operating System: Windows XP SP2 PHP Version: 5.2.4 New Comment: Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. Previous Comments: ------------------------------------------------------------------------ [2007-10-27 18:21:01] commentgg at hotmail dot com Description: ------------ The wiki in development went from delivering total meltdown on the server to being very stable just by changing the code from: $n=0; preg_replace(/../,'..',$x,-1,$n); if($n) .. to $new = preg_replace(/../,'..',$x); if($new != $x) .. I.e. do not use the count parameter! Reproduce code: --------------- I can't give you any specifics yet, but I spent 3 days narrowing down and then having the above solve the problem for me. Sorry can't help you out better. Actual result: -------------- Crashes brought the Apache webserver (not the absolute latest) down on my pre 5.2.4 version. Upgrading to the latest PHP (5.2.4) delivered a better experience as the server managed to recover. In both cases no error message was given. It all just ends in the Windows Application Crash - Send Report feedback loop dialog box. Twice. Maybe this is a PECL issue, but it is severe enough to warrant attention. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=43117&edit=1