3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $username = $_GET['username'] ?? 'nobody'; echo $username;
Output for 7.0.0 - 7.2.0
nobody
Output for 5.3.18 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/vMGoG on line 3
Process exited with code 255.