3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = null; $y = null; echo $x ?? $y ?? 'Hello';
Output for 7.0.0 - 7.3.0
Hello
Output for 5.3.19 - 5.6.38
Parse error: syntax error, unexpected '?' in /in/5ih3o on line 6
Process exited with code 255.