From: jdespatis at yahoo dot fr Operating system: Linux Debian PHP version: 5.2.5 PHP Bug Type: Regexps related Bug description: preg_replace_callback is very ver slow on a 36k xml file
Description: ------------ I have a 36k xml file I launch preg_replace_callback on it, but php runs crazy 99% CPU Reproduce code: --------------- test case try this code with the 1087985.xml i give in attachment: the aim is to cut the string ended by \r or \n or \x0, and launch a specific function (protocol_analyse) on each message <?php function protocol_analyse($m) { echo "protocol_analyse:\n"; print_r($m); } $buff = file_get_contents("1087985.xml"); $start = microtime(true); $buff = preg_replace_callback("/([^\r\n\\x00]*)[\r\n\\x00]+/m", "protocol_analyse", $buff); $end = microtime(true); printf("Duration : %.2f", $end - $start); ?> Expected result: ---------------- I expect the function to returns quick, but 99% CPU taken Actual result: -------------- Duration : 133.00 sec which is very very slow -- Edit bug report at http://bugs.php.net/?id=43920&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=43920&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=43920&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=43920&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=43920&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=43920&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=43920&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=43920&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=43920&r=needscript Try newer version: http://bugs.php.net/fix.php?id=43920&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=43920&r=support Expected behavior: http://bugs.php.net/fix.php?id=43920&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=43920&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=43920&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=43920&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=43920&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=43920&r=dst IIS Stability: http://bugs.php.net/fix.php?id=43920&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=43920&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=43920&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=43920&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=43920&r=mysqlcfg