3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $bits = 0; while ($r >>= 1) { echo $bits++; }
Output for 5.0.4 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: r in /in/eWeIv on line 5
Output for hhvm-3.12.0
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: r in /in/eWeIv on line 5