3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function a(&$a, &$b) { $a =& $b; } $a = 1; $b = 2; a($a, $b); $b = 3; print $a;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1