3v4l.org

run code in 500+ PHP versions simultaneously
<?php interface ValidatorRuleInterface { public function __invoke (mixed $value): ?ValidationError; }
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.6
preferences:
65.7 ms | 979 KiB | 4 Q