3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $msb = -1 * pow(2,63); for ($i=62; $i >= 0; $i--) { $result = pow(2,$i); $msb += $result; } echo '<p>***',$msb,'****</p>';
Output for 4.3.0 - 4.3.1, 4.3.5 - 7.1.10
<p>***-1****</p>
Output for 4.3.2 - 4.3.4
<p>***1.844674407371E+19****</p>