note 87355 added to function.is-null
| From: | george at fauxpanels dot com | Date: | Mon, 01 Dec 2008 21:58:13 +0000 |
| Subject: | note 87355 added to function.is-null | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-147496@lists.php.net to get a copy of this message | ||
See how php parses different values. $var is the variable.
$var = NULL "" 0 "0" 1
strlen($var) = 0 0 1 1 1
is_null($var) = TRUE FALSE FALSE FALSE FALSE
$var == "" = TRUE TRUE TRUE FALSE FALSE
!$var = TRUE TRUE TRUE TRUE FALSE
!is_null($var) = FALSE TRUE TRUE TRUE TRUE
$var != "" = FALSE FALSE FALSE TRUE TRUE
$var = FALSE FALSE FALSE FALSE TRUE
Peace!
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Manual Page -- http://www.php.net/manual/en/function.is-null.php
Edit -- https://master.php.net/note/edit/87355
Del: integrated -- https://master.php.net/note/delete/87355/integrated
Del: useless -- https://master.php.net/note/delete/87355/useless
Del: bad code -- https://master.php.net/note/delete/87355/bad+code
Del: spam -- https://master.php.net/note/delete/87355/spam
Del: non-english -- https://master.php.net/note/delete/87355/non-english
Del: in docs -- https://master.php.net/note/delete/87355/in+docs
Del: other reasons-- https://master.php.net/note/delete/87355
Reject -- https://master.php.net/note/reject/87355
Search -- https://master.php.net/manage/user-notes.php