#38505 [NEW]: Reopen bug #26982

From: trevan at therichins dot net Operating system: Debian sid (linux kernel 2.4.29) PHP version: 5.1.5 PHP Bug Type: Scripting Engine problem Bug description: Reopen bug #26982 Description: ------------ I discovered a memory leak in my script and so was looking through the database to see if it was fixed in CVS. That brought me to bug #26982 which is identical to my problem. The answer given there was that it is expected behaviour, but I don't quite understand why? I would have expected the behaviour to have an increase in memory usage but than have it stop after the garbage collector catches up. But, I am instead seeing the memory constantly increase. This behaviour prevents PHP from being used as a Linux service (which is what I am trying to do) as many php libraries out there use this method to create strings. Reproduce code: --------------- <?php $database = 'mysql'; while (1) { $old = memory_get_usage(); "database_{$database}"; $new = memory_get_usage(); echo $new - $old; echo "\n"; sleep(1); } ?> Expected result: ---------------- I would expect the memory to go up for a while and then stop as the garbage collector catches up and cleans out the old strings. Actual result: -------------- It shows a constant increase of 16 bytes. -- Edit bug report at http://bugs.php.net/?id=38505&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=38505&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=38505&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=38505&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=38505&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=38505&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=38505&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=38505&r=needscript Try newer version: http://bugs.php.net/fix.php?id=38505&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=38505&r=support Expected behavior: http://bugs.php.net/fix.php?id=38505&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=38505&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=38505&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=38505&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=38505&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=38505&r=dst IIS Stability: http://bugs.php.net/fix.php?id=38505&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=38505&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=38505&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=38505&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=38505&r=mysqlcfg