3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $b = 1; $a = array(); for($i=100000;$i-->0;) $a[] =& $b; for($i=100000;$i-->0;) unset($a[$i]);
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
Output for hhvm-3.10.0 - 3.12.0

Process exited with code 137.