3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function myfunction(&$myvalue = null) { echo $myvalue; } myfunction("ok");
Output for 5.3.0 - 5.4.30
Fatal error: Only variables can be passed by reference in /in/X2oHX on line 6
Process exited with code 255.