3v4l.org

run code in 300+ PHP versions simultaneously
<?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 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<p>***-1****</p>
Output for 4.3.2 - 4.3.4
<p>***1.844674407371E+19****</p>
preferences:
343.85 ms | 401 KiB | 460 Q