3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = null; $b = 'b'; $username = $a ?? $b ?? 'nobody'; echo $username;
based on MrNBC
Output for 7.0.0 - 7.2.0
b
Output for 5.3.21 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/igHFK on line 4
Process exited with code 255.