3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = null; var_dump($x ?? 'y');
based on 5jstH
Output for hhvm-3.15.4, 7.0.0 - 7.2.6
string(1) "y"
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/ukWHC on line 3
Process exited with code 255.