3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a='bill'; $$a = 'food'; $$$a='bar'; echo $foo;
Output for 5.0.4 - 7.1.7
Notice: Undefined variable: foo in /in/XVvS0 on line 6
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: foo in /in/XVvS0 on line 6