3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface Ia {} class Foo { protected function xyz(Ia $x) {} } interface Ib extends Ia {} class Bar extends Foo { protected function xyz(Ib $x) {} }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Declaration of Bar::xyz(Ib $x) must be compatible with Foo::xyz(Ia $x) in /in/JUndH on line 8
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Declaration of Bar::xyz(Ib $x) should be compatible with Foo::xyz(Ia $x) in /in/JUndH on line 8
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(Ib $x) should be compatible with Foo::xyz(Ia $x) in /in/JUndH 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(Ia $x) in /in/JUndH on line 9

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150.38 ms | 401 KiB | 178 Q