3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = '12d9'; ++$a; echo $a, "\n"; ++$a; echo $a;
based on Q1LTb
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
12e0 13