3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 'a'; $b = 'b'; $$a = 'foo'; $$$a = 'c'; echo $a;
Output for 5.5.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: foo in /in/D5eFZ on line 6 foo
Output for 4.3.0 - 5.4.45
foo