3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { public function m(): void {} } class B extends A { public function m() {} }
Output for 7.1.25 - 7.1.30, 7.2.0 - 7.2.20, 7.3.0 - 7.3.7
Fatal error: Declaration of B::m() must be compatible with A::m(): void in /in/2aoJs on line 11
Process exited with code 255.

preferences:
160.84 ms | 1000 KiB | 7 Q