note 71562 added to language.operators.type
| From: | mikael dot knutsson at gmail dot com | Date: | Wed, 06 Dec 2006 04:34:41 +0000 |
| Subject: | note 71562 added to language.operators.type | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-120327@lists.php.net to get a copy of this message | ||
I can confirm what thisbizness at gmail dot com said just below in PHP 5.2, furthermore, people
looking to use this as a "if $a is not instance of A" for error throwing purposes or
other, just type it like this:
<?php
if( !$a instanceof A ) {
throw new Exception( '$a is not instance of A.' );
}
?>
This also works if $a is not an object, or not even set (you will get an E_NOTICE if it isn't
set though).
A note worth making is that if you are unsure of if class A is present when making this comparison,
and you don't want to trigger the __autoload() magic method, scroll down for examples of how to
get around this.
I was unsure about it at first since most other operators have their own negative (like !=) or they
are/can be used as function calls (like !is_a()) but it is this simple. Hope it helps someone.
Until again!
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Manual Page -- http://www.php.net/manual/en/language.operators.type.php
Edit -- https://master.php.net/note/edit/71562
Del: integrated -- https://master.php.net/note/delete/71562/integrated
Del: useless -- https://master.php.net/note/delete/71562/useless
Del: bad code -- https://master.php.net/note/delete/71562/bad+code
Del: spam -- https://master.php.net/note/delete/71562/spam
Del: non-english -- https://master.php.net/note/delete/71562/non-english
Del: in docs -- https://master.php.net/note/delete/71562/in+docs
Del: other reasons-- https://master.php.net/note/delete/71562
Reject -- https://master.php.net/note/reject/71562
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