Bug #52536 [NEW]: array_shift memory leak.

From: Operating system: CentOS 5.3 PHP version: 5.3.3 Package: Performance problem Bug Type: Bug Bug description:array_shift memory leak. Description: ------------ array_shift is causing a memory leak when used. Take the following code: if (count($write->writeBuffer)) { $data = array_shift($write->writeBuffer); $written = fwrite($stream, $data); if ($written !== FALSE) { if ($written < strlen($data)) { array_unshift($write->writeBuffer, substr($data, $written)); } } } When running under as a daemon process, memory will continue to rise with this code. However, simply changing the code to: if (count($write->writeBuffer)) { //print_r($write); $data = reset($write->writeBuffer); $key = key($write->writeBuffer); //echo "writing data: $data\n"; $written = fwrite($stream, $data); if ($written !== FALSE) { if ($written < strlen($data)) { $write->writeBuffer[$key] = substr($data, $written); } else { unset($write->writeBuffer[$key]); } } } Fixes the problem and no longer leaks and stays at a steady number. Test script: --------------- requires a long running process that repeatedly calls array_shift to demonstrate Expected result: ---------------- Memory to be freed that is used for the array_shift operation. Actual result: -------------- Memory is not freed upon use and contiously climbs in total memory consumption by the PHP process. -- Edit bug report at http://bugs.php.net/bug.php?id=52536&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=52536&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=52536&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=52536&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=52536&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=52536&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=52536&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=52536&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=52536&r=needscript Try newer version: http://bugs.php.net/fix.php?id=52536&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=52536&r=support Expected behavior: http://bugs.php.net/fix.php?id=52536&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=52536&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=52536&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=52536&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=52536&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=52536&r=dst IIS Stability: http://bugs.php.net/fix.php?id=52536&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=52536&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=52536&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=52536&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=52536&r=mysqlcfg