Bug #76051 [Opn]: Inconsistent behavior with overriding constants in interfaces

Edit report at https://bugs.php.net/bug.php?id=76051&edit=1 ID: 76051 User updated by: korikulum at net dot hr Reported by: korikulum at net dot hr Summary: Inconsistent behavior with overriding constants in interfaces Status: Open Type: Bug Package: Class/Object related PHP Version: 7.1.15 Block user comment: N Private report: N New Comment: Update Previous Comments: ------------------------------------------------------------------------ [2018-03-05 13:28:06] korikulum at net dot hr Description: ------------ Overriding constants defined in interfaces isn't allowed in classes that implement the interface, but is in classes that extend classes that implement the interface. Test script: --------------- <?php interface FooInterface { const BAR = ''; } class Foo implements FooInterface { const BAR = 'BAR'; } $baz = new Foo; var_dump($baz::BAR); https://3v4l.org/qVreY <?php interface FooInterface { const BAR = ''; } abstract class AbstractFoo implements FooInterface { } class Foo extends AbstractFoo { const BAR = 'BAR'; } $baz = new Foo; var_dump($baz::BAR); https://3v4l.org/9S53j Expected result: ---------------- Either both cases work or both result in the error "Fatal error: Cannot inherit previously-inherited or override constant SOME_CONST from interface MyInterface". Actual result: -------------- The first case gives the error "Fatal error: Cannot inherit previously-inherited or override constant SOME_CONST from interface MyInterface". The second case works normally. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=76051&edit=1