3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo = null; $bar = 5; echo $foo ?? $bar;
Output for hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0beta1
5
Output for 5.6.30
Parse error: syntax error, unexpected '?' in /in/ilAGE on line 6
Process exited with code 255.