3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $eval = 1; $a = "trim"; echo $$a;
based on UrMVh
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.21.3, 7.0.0 - 7.3.0beta1
Notice: Undefined variable: trim in /in/6Rban on line 7
Output for hhvm-3.22.0
Notice: Undefined variable: trim in /in/6Rban on line -1