3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a=[1,2,3,4]; foreach($a as &$v) { echo "$v\n"; array_pop($a);}
based on Ufmtl
Output for hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
1 2
Output for 5.5.0 - 5.6.30
1 2 1 1