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<?php interface Fooable { } class Foo implements Fooable {} abstract class Bar { public function dump(Foo $object) { var_dump($object); } } class Baz extends Bar { public function dump(Fooable $object) { var_dump($object); } } (new Baz)->dump(new Foo);
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
object(Foo)#2 (0) { }
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Warning: Declaration of Baz::dump(Fooable $object) should be compatible with Bar::dump(Foo $object) in /in/nWVSM on line 23 object(Foo)#2 (0) { }
Output for 5.6.0 - 5.6.40
Strict Standards: Declaration of Baz::dump() should be compatible with Bar::dump(Foo $object) in /in/nWVSM on line 23 object(Foo)#2 (0) { }

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