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Request #62089 instanceof operator type variable from function
Submitted: 2012-05-21 09:56 UTC Modified: 2021-03-31 16:38 UTC
From: php dot net at kingsquare dot nl Assigned: cmb (profile)
Status: Closed Package: *General Issues
PHP Version: Irrelevant OS: n/a
Private report: No CVE-ID: None
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 [2012-05-21 09:56 UTC] php dot net at kingsquare dot nl
Description:
------------
This might be a 'feature request', a bug or just a documentation issue..

We can use the instanceof operator using variables:
i.e.
$objectType = 'StdClass'
$this instanceof $objectType

works flawlessly!

But in order to prevent introducing a variable needed just because of the check 
i would have guessed i could be able to do:

$this instanceof get_class($this)

(ofcourse the actual usage would be something else, this is just to illustrate 
the usage of a function to retrieve some type of class name)


Test script:
---------------
class Foo {
	function getClass() {
		return __CLASS__;
	}
}

$bar = new Foo();

var_dump($bar instanceof $bar->getClass());
exit;

Expected result:
----------------
true

Actual result:
--------------
Parse error: syntax error, unexpected '('

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 [2021-03-31 16:38 UTC] cmb@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: cmb
 [2021-03-31 16:38 UTC] cmb@php.net
This is possible as of PHP 8.0.0; you need to enclose the right
hand side of the instanceof operator in parentheses, though:
<https://3v4l.org/oBvfJ>
 
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