3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a=function($x){echo "--$x--";}; array_walk(array("dies","ist",1,"test"),$a);
Output for 5.3.0 - 5.4.27
Fatal error: Only variables can be passed by reference in /in/oUHm3 on line 4
Process exited with code 255.