3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $var = "a"; $$var == 5;
Output for 5.0.4 - 7.1.10
Notice: Undefined variable: a in /in/pgVbO on line 3
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/pgVbO on line 3