3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = null; echo $a ?? 'empty';
based on Gj67h
Output for 7.0.0 - 7.2.0
empty
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/REcO3 on line 4
Process exited with code 255.