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<?php interface FooInterface { public function dump(FooInterface $baz); } class Foo implements FooInterface { public function dump(FooInterface $baz) { var_dump($baz); } } class Bar extends Foo { public function dump(FooInterface $baz) { parent::dump($baz); } } (new Foo)->dump(new Bar); (new Bar)->dump(new Bar); (new Bar)->dump(new Foo);
Output for git.master, git.master_jit, rfc.property-hooks
object(Bar)#2 (0) { } object(Bar)#2 (0) { } object(Foo)#2 (0) { }

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