3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function setValue($value): void { } } class Bar extends Foo { public function setValue(mixed $value): void { } }
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Output for 7.4.0 - 7.4.33
Warning: Declaration of Bar::setValue(mixed $value): void should be compatible with Foo::setValue($value): void in /in/GAoP2 on line 16
preferences:
112.97 ms | 407 KiB | 5 Q