3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface I{} class Data implements I{} abstract class P { public function getThing(): ?I { return null; } } class C extends P { public function getThing(): Data { return new Data; } } var_dump((new C)->getThing());
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
object(Data)#2 (0) { }
preferences:
86.74 ms | 1107 KiB | 4 Q