3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 1; $b = &$a; echo (++$a)+(++$a); ?>
based on Y0Gf7
Output for 7.0.0 - 7.2.0
5
Output for 5.3.18 - 5.6.28
6