#31265 [NEW]: strange behaviour of array_keys function

From: dmitry dot bezer at enterra-inc dot com Operating system: Windows XP PHP version: 4.3.10 PHP Bug Type: Scripting Engine problem Bug description: strange behaviour of array_keys function Description: ------------ After setting up PHP4.3.10 my application stoped working with error message saying about error in one of PEAR files. After looking into code that caused error I figured out a very strange thing: the array_keys function gets as parameter a valid array but returns NULL. I tried to reproduce the bug without using PEAR files but didn't succeed. So I will describe the issue using PEAR code. File: PEAR/DB/dataobject.php (version 1.7.2) (DB_DataObject PEAR package) P.S. I have no Zend debuger/optimizer/.... or any 3rd party extensions installed php -v result: C:\wwwroot\bug>php -v PHP 4.3.10 (cgi-fcgi) (built: Dec 14 2004 17:47:59) Copyright (c) 1997-2004 The PHP Group Zend Engine v1.3.0, Copyright (c) 1998-2004 Zend Technologies Reproduce code: --------------- 795 if (is_object($from)) { 796 $table = $from->__table; 797 $from = array_keys($from->table()); 798 } $from->table() returns a valid array , but $from after assignment becomes NULL. If we modidfy the code in the following way: 795 if (is_object($from)) { 796 $table = $from->__table; $tmp = $from->table(); var_dump($tmp); 797 $from = array_keys($tmp); var_dump($from) die('theend'); 798 } the result will be: array(2) { ["id"]=> int(129) ["name"]=> int(2) } NULL theend moreover if we modify the code in another way: if (is_object($from)) { $table = $from->__table; $tmp = $from->table(); $from = null; $from = array_keys($tmp); } PHP crashes and Windows offers to send a report to Bill Gates :) -- Edit bug report at http://bugs.php.net/?id=31265&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=31265&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=31265&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=31265&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=31265&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=31265&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=31265&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=31265&r=needscript Try newer version: http://bugs.php.net/fix.php?id=31265&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=31265&r=support Expected behavior: http://bugs.php.net/fix.php?id=31265&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=31265&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=31265&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=31265&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=31265&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=31265&r=dst IIS Stability: http://bugs.php.net/fix.php?id=31265&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=31265&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=31265&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=31265&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=31265&r=mysqlcfg