Bug #75853 [Opn]: Unexpected fatal error invoking static method as callables

Edit report at https://bugs.php.net/bug.php?id=75853&edit=1 ID: 75853 Updated by: cmb@php.net Reported by: marcospassos dot com at gmail dot com Summary: Unexpected fatal error invoking static method as callables Status: Open Type: Bug Package: Class/Object related PHP Version: 7.2.2RC1 Block user comment: N Private report: N New Comment: Also note that not only parent:: is_callable() , but actually any parent class of the class designated by the first array element. E.g. <https://3v4l.org/QULq6>. In my opionion that's rather dubious, but we may not be able to change this for BC reasons. Previous Comments: ------------------------------------------------------------------------ [2018-01-22 00:46:05] marcospassos dot com at gmail dot com From manual: http://php.net/manual/en/language.types.callable.php // Type 5: Relative static class method call (As of PHP 5.3.0) class A { public static function who() { echo "A\n"; } } class B extends A { public static function who() { echo "B\n"; } } call_user_func(array('B', 'parent::who')); // A ------------------------------------------------------------------------ [2018-01-22 00:40:43] danack@php.net > which is a perfectly valid form of callable. Other than, "it kind of works some of the time", what's the justification for saying that it's a valid form of callable? i.e. is it in the manual anywhere? ------------------------------------------------------------------------ [2018-01-21 22:25:33] marcospassos dot com at gmail dot com I can't see any real use case for this. However, my point is that type-hinting against a callable should ensure that the argument is a function/method, so there is a problem in the pseudo-type checking mechanism indeed. ------------------------------------------------------------------------ [2018-01-21 19:37:57] levim@php.net This is one of the times I'm want to see some rationale as to why the bug is with callable and not with everything else. You are statically using child's symbol but statically referring to the parent method? If it was dynamic there *might* be a use-case for that but at least directly as written I don't see the value. Is there some use I'm missing? ------------------------------------------------------------------------ [2018-01-21 19:10:52] marcospassos dot com at gmail dot com Description: ------------ An unrecoverable error occurs when a static method is called as a callable, in the form of [ClassName::class, 'parent::staticMethod'], which is a perfectly valid form of callable. The same does not occur invoking the callable through call_user_func, call_user_func_array or ReflectionMethod::invoke. Test script: --------------- https://3v4l.org/pdTUN Expected result: ---------------- foo ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75853&edit=1