3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = 0; $a = &$x; $b = &$a; $x = 2; $b++; echo $a . ', ' . $b;
based on jcPoB
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
3, 3
Output for hhvm-3.10.0

Process exited with code 153.