3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface Ia {} interface Ib extends Ia {} class Foo { protected function xyz(Ib $x) {} } class Bar extends Foo { protected function xyz(Ia $x) {} }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Warning: Declaration of Bar::xyz(Ia $x) should be compatible with Foo::xyz(Ib $x) in /in/66uJQ on line 9
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Strict Standards: Declaration of Bar::xyz() should be compatible with Foo::xyz(Ib $x) in /in/66uJQ on line 9
preferences:
144.05 ms | 402 KiB | 185 Q