3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface ValidatorRuleInterface { public function __invoke (mixed $value): ?ValidationError; }
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
preferences:
55.66 ms | 406 KiB | 5 Q