3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 0; echo $a + ++$a;
Output for 5.1.0 - 5.6.20, hhvm-3.9.1, hhvm-3.11.0 - 3.12.0, 7.0.0 - 7.0.5
2
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.5
1