3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { function foo(callable $fn): void { $fn(); } function a() { $this->foo(function () { echo "yo"; }); } function b() { $this->foo(static function () { echo "yo"; }); } }
Output for 8.1.34, 8.2.27 - 8.2.30, 8.3.0 - 8.3.29, 8.4.1 - 8.4.16, 8.5.0 - 8.5.1

preferences:
51.21 ms | 406 KiB | 5 Q