From: Operating system: Ubuntu 9.10 PHP version: 5.3.3 Package: Regexps related Bug Type: Bug Bug description:ereg_replace uses 100% cpu and takes >10 minutes to execute.
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. -- Edit bug report at http://bugs.php.net/bug.php?id=53099&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=53099&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=53099&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=53099&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=53099&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=53099&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=53099&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=53099&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=53099&r=needscript Try newer version: http://bugs.php.net/fix.php?id=53099&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=53099&r=support Expected behavior: http://bugs.php.net/fix.php?id=53099&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=53099&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=53099&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=53099&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=53099&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=53099&r=dst IIS Stability: http://bugs.php.net/fix.php?id=53099&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=53099&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=53099&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=53099&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=53099&r=mysqlcfg
