class_implements() has wrong return type in PHP 7.x

[melkamar]

Support question

I'm trying to fix static typing issue in my code but whatever I do, something complains. With the following code PHPStorm's EA extension complains (rightly) that $messageInterfaces might not support array operations (because it may be false):

$messageInterfaces = \class_implements('SomeClass');
$messageInterfaces[] = 'foobar';

But when I fix this and check for false, then PHPStan complains that comparison between false and array is always false.

https://phpstan.org/r/6e1121b4-9b76-4403-8125-767d5b0003bc

What I don't understand is why this works fine with PHP8. To my knowledge the signature of \class_implements() did not change between 7.4 and 8.

[ondrejmirtes]

Please follow this issue template: https://github.com/phpstan/phpstan/issues/new?template=Function_signature_mismatch.md

Please send a pull request in phpstan/phpstan-src that updates file resources/functionMap.php instead. Thank you.

[melkamar]

Done, sorry for not noticing that straight away. Closing this in favor of the PR.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.