3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public const BAR = BAZ; } try { new Foo(); } catch (Throwable $e) { echo (string) $e . "\n"; } define('BAZ', 'BAZ'); new Foo(); var_dump(Foo::BAR);

preferences:
182.81 ms | 405 KiB | 5 Q