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 - 8.2.32, 8.3.0 - 8.3.33, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9
preferences:
58.54 ms | 1031 KiB | 4 Q