Bug #79731 [Opn->Wfx]: Public abstract method on trait fulfilled by private method

Edit report at https://bugs.php.net/bug.php?id=79731&edit=1 ID: 79731 Updated by: nikic@php.net Reported by: donatj at gmail dot com Summary: Public abstract method on trait fulfilled by private method -Status: Open +Status: Wont fix Type: Bug Package: Scripting Engine problem Operating System: All PHP Version: master-Git-2020-06-24 (Git) Block user comment: N Private report: N New Comment: This is allowed for backwards compatibility reasons. Private abstract functions in traits are only supported since PHP 8. Previous Comments: ------------------------------------------------------------------------ [2020-06-24 19:47:27] donatj at gmail dot com Description: ------------ A public abstract method declaration on a trait is fulfilled by a private method on a 'use'-ing class. This seems like an incorrect behaviour. You can see on https://3v4l.org/a65oD that the problem exists even in git-master It is inconsistent with abstract classes or interfaces. Test script: --------------- <?php trait ATrait { abstract public function foo( string $url ) : int; } class AClass { use ATrait; private function foo( string $url ) : int { return 10; } } Expected result: ---------------- Behave either like interfaces: "Fatal error: Access type for interface method ATrait::foo() must be omitted in - on line 4" Similar to interfaces OR like an abstract class: "Fatal error: Access level to ATrait::foo() must be public (as in class ParentClass) in - on line 8" Actual result: -------------- No error ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79731&edit=1