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Doc Bug #80764 method magic constant in closure loses class
Submitted: 2021-02-17 18:15 UTC Modified: 2021-02-18 15:12 UTC
From: bernievbb at icloud dot com Assigned:
Status: Verified Package: *General Issues
PHP Version: 8.0Git-2021-02-17 (Git) OS: macos
Private report: No CVE-ID: None
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 [2021-02-17 18:15 UTC] bernievbb at icloud dot com
Description:
------------
class and method are lost when __METHOD__ called in closure.

Test script:
---------------
<?php
 namespace pdox\pal;
class test
{
    function test1()
    {
        var_dump(__METHOD__); // string(21) "pdox\pal\test::test1"

        $a = function() {return __METHOD__;};
        var_dump($a());                // string(18) "pdox\pal\{closure}"

        $b = fn() => __METHOD__;
        var_dump($b());               // string(18) "pdox\pal\{closure}"
    }
}?>



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 [2021-02-18 11:18 UTC] cmb@php.net
-Status: Open +Status: Verified -Type: Bug +Type: Documentation Problem
 [2021-02-18 11:18 UTC] cmb@php.net
For funtions, __METHOD__ is a synonym for __FUNCTION__[1].
Anonymous functions are *functions*, so this behaves as intended,
although the documentation[2] should be improved.

[1] <https://3v4l.org/fr6E6>
[2] <https://www.php.net/manual/en/language.constants.magic.php>
 [2021-02-18 15:12 UTC] bernievbb at icloud dot com
Clearly __METHOD__ is NOT just a synonym for __FUNCTION__ ...

All inside a namespaced class method:

NOT in closure:

__FUNCTION__ => method name
__METHOD__   => namespace + className + "::" + methodName
__CLASS__    => namespace + className

IN a closure:

__FUNCTION__ => namespace + "{closure}"
__METHOD__   => namespace + "{closure}"
__CLASS__    => namespace + className


I would expect __METHOD__ to report the closure's parent method.

To be consistent with not in a closure I would also reasonably expect __METHOD__ to provide the class name.

__METHOD__ and __FUNCTION__ are useless in a closure. Surely this is not intended.

I see no simple alternative. Think debugging, logging etc.
 
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