3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo = null; $base = 1024; echo null ?? 'nop';
based on 6nZaS
Output for 7.0.0 - 7.2.0
nop
Output for 5.3.21 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/LaCI2 on line 5
Process exited with code 255.