3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $msb = -( pow(2,63) ); for ($i=62; $i >= 0; $i--) { $result = pow(2,$i); $msb += $result; } echo $msb;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
-1