3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = null; echo $x ?? "LL";
based on P1pu9
Output for hhvm-3.15.4, 7.0.0 - 7.3.0rc3
LL
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/33opr on line 5
Process exited with code 255.