3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $first_number = 10; $$first_number += 2; echo $first_number; ?>
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: 10 in /in/l8GHU on line 4 10
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: 10 in /in/l8GHU on line 4 10