3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface Foo { public function a(Foo $a): void; public function b(Foo $b): void; } class Bar implements Foo { public function a(Foo $a):void {} public function b($b):void {} }
Output for 8.1.30 - 8.1.33, 8.2.22 - 8.2.29, 8.3.5 - 8.3.25, 8.4.1 - 8.4.12

preferences:
50.8 ms | 406 KiB | 5 Q