3v4l.org

run code in 300+ PHP versions simultaneously
<?php $num = (PHP_INT_MAX * 2) + 1; var_dump($num); var_dump(0xffffffffffffffff); echo dechex(PHP_INT_MAX *2 - 1),"\n"; echo dechex(-1);

preferences:
28.85 ms | 402 KiB | 5 Q