3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = array(); $y = array(); for ($i=100000; $i--;)$y[$i] =& $x; for ($i=100000; $i--;)unset($y[$i]);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0