3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function a(&$n){++$n;}//├ęcho a(5); echo a(5);
Output for 5.3.0 - 5.4.20
Fatal error: Only variables can be passed by reference in /in/fvQ4H on line 4
Process exited with code 255.