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Bug #78887 Side-effects for uninitialised typed property
Submitted: 2019-11-29 14:54 UTC Modified: 2019-12-08 07:46 UTC
From: andi dot wr at googlemail dot com Assigned:
Status: Closed Package: SPL related
PHP Version: 7.4.0 OS: Linux
Private report: No CVE-ID: None
 [2019-11-29 14:54 UTC] andi dot wr at googlemail dot com
Description:
------------
After loading a class which inherits from other classes and parent classes are loaded by autoloader, get_declared_classes() gives another order than in previous PHP versions.

< 7.4: parent => child
7.4: child => parent

Result of code example (reverse order of get_declared_classes()):

Array
(
    [0] => A
    [1] => B
    ...
)

vs.

Array
(
    [0] => B
    [1] => A
    ...
)

Url: https://3v4l.org/lEnsR

Test script:
---------------
<?php

spl_autoload_register(function($class){
    if ($class === 'A') {
        eval("class A { }");
    }
});

class B extends A {
    
}

print_r(array_reverse(get_declared_classes()));

Expected result:
----------------
Parent class(es) should be declared before child class.

Actual result:
--------------
Parent classes are declared before child class.

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2019-11-29 14:56 UTC] requinix@php.net
-Status: Open +Status: Feedback
 [2019-11-29 14:56 UTC] requinix@php.net
Sounds like undefined behavior to me. Is there documentation somewhere that says they'll be returned in a certain order?
 [2019-11-29 22:43 UTC] nikic@php.net
Definitely unspecified behavior, at best an upgrading note can be added for this.
 [2019-12-08 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 [2019-12-08 07:46 UTC] nikic@php.net
-Summary: Changed order in get_declared_classes() with parent(s) loaded by autoloader +Summary: Side-effects for uninitialised typed property -Status: No Feedback +Status: Re-Opened
 [2019-12-08 07:46 UTC] nikic@php.net
Reopening for upgrading note.
 [2019-12-09 07:58 UTC] nikic@php.net
Automatic comment on behalf of nikita.ppv@gmail.com
Revision: http://git.php.net/?p=php-src.git;a=commit;h=3d90b770e8d490989294101745d161b8347ae9d4
Log: Fix bug #78887: Add upgrading note about get_declared_classes() order
 [2019-12-09 07:58 UTC] nikic@php.net
-Status: Re-Opened +Status: Closed
 
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