3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $trim = 1; $a = "trim"; echo $$a;
based on 6Rban
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
1