Bug #13577 Updated: is_null evaluates true for non-existent variables

ID: 13577 Updated by: mfischer@php.net Reported By: sander@php.net -Status: Open +Status: Closed Bug Type: Documentation problem Operating System: Win2K & Debian Linux PHP Version: 4.0.6 New Comment: This bug has been fixed in CVS. You can grab a snapshot of the CVS version at http://snaps.php.net/. In case this was a documentation problem, the fix will show up soon at http://www.php.net/manual/. In case this was a PHP.net website problem, the change will show up on the PHP.net site and on the mirror sites. Thank you for the report, and for helping us make PHP better. Previous Comments: ------------------------------------------------------------------------ [2001-10-07 09:57:05] jeroen@php.net An uninitialized variable equals NULL. So it _is_ null. This should be in the language.types.null section. ------------------------------------------------------------------------ [2001-10-07 07:10:43] sander@php.net If it's intended, then it should be documented. Reopened as a documentation problem. ------------------------------------------------------------------------ [2001-10-06 20:29:59] sniper@php.net Intented behaviour. Not a bug. ------------------------------------------------------------------------ [2001-10-06 15:41:15] sander@php.net is_null() evaluates true for non-existent variables. Consider the following snippet: unset($foo); if(is_null($foo)) echo 'true'; else echo 'false'; It outputs 'true'. Can this be fixed before 4.0.7? ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=13577&edit=1