#43072 [NEW]: undesirable invalid argument in foreach

From: php at bucksvsbytes dot com Operating system: Ubuntu PHP version: 5.2.4 PHP Bug Type: Scripting Engine problem Bug description: undesirable invalid argument in foreach Description: ------------ In PHP4, foreach($array) runs without error if $array is an uninitialized array. The foreach block is executed 0 times. This is consistent with other 0 iteration blocks such as while(false) and for($i=0;$i<0). In PHP5, an inconsistency was introduced by throwing an "invalid argument" warning when $array is an uninitialized array. In upgrading to PHP5 I had to add a surrounding if($array) block to hundreds of foreach blocks to eliminate the possible warning message. Reproduce code: --------------- unset($array);//just to clarify initial conditions foreach($array['phone'] as $key=>$phone){ echo $phone.'<br/>'; } Expected result: ---------------- I expect no errors and nothing echoed. This is PHP4 behavior. Actual result: -------------- In PHP5, following message pointlessly prints: Warning: Invalid argument supplied for foreach() in ... -- Edit bug report at http://bugs.php.net/?id=43072&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=43072&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=43072&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=43072&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=43072&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=43072&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=43072&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=43072&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=43072&r=needscript Try newer version: http://bugs.php.net/fix.php?id=43072&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=43072&r=support Expected behavior: http://bugs.php.net/fix.php?id=43072&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=43072&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=43072&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=43072&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=43072&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=43072&r=dst IIS Stability: http://bugs.php.net/fix.php?id=43072&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=43072&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=43072&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=43072&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=43072&r=mysqlcfg