3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arg="hallo"; echo $$arg;
Output for 5.0.4 - 7.2.6
Notice: Undefined variable: hallo in /in/SCv1V on line 4
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: hallo in /in/SCv1V on line 4