Bug #13577 Updated: is_null evaluates true for non-existent variables
| From: | jeroen@php.net | Date: | Sun, 07 Oct 2001 13:57:06 +0000 |
| Subject: | Bug #13577 Updated: is_null evaluates true for non-existent variables | ||
| References: | 1 | Groups: | php.dev php.doc |
| Request: | Send a blank email to php-dev+get-67482@lists.php.net to get a copy of this message | ||
ID: 13577
Updated by: jeroen
Reported By: sander@php.net
Status: Open
Bug Type: Documentation problem
Operating System: Win2K & Debian Linux
PHP Version: 4.0.6
New Comment:
An uninitialized variable equals NULL. So it _is_ null.
This should be in the language.types.null section.
Previous Comments:
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[2001-10-07 07:10:43] sander@php.net
If it's intended, then it should be documented.
Reopened as a documentation problem.
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[2001-10-06 20:29:59] sniper@php.net
Intented behaviour. Not a bug.
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[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?
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Edit this bug report at http://bugs.php.net/?id=13577&edit=1