3v4l.org

run code in 300+ PHP versions simultaneously
<?php $val1 = pow(2, 64); $val2 = $val1 - 1; echo $val1; echo $val2; echo number_format($val1, 0, '', '') . "<br/>"; echo number_format($val2, 0, '', '') . "<br/>";

preferences:
49.06 ms | 402 KiB | 5 Q