3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 1; $b = &$a; echo ++$a; echo (++$a)+(++$a); ?>
based on Evs7o
Output for 7.0.0 - 7.2.0
27
Output for 5.4.0 - 5.6.28
28