3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $bits = 64; $N = 0xffffffffffffffff; $result = -( pow(2, $bits) - $N ); echo $result;
Output for 7.0.2 - 7.2.0
-0
Output for 4.3.0 - 7.0.1
0