3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = $b ?? $k;
Output for 7.0.0 - 7.2.0
Notice: Undefined variable: k in /in/TIp3M on line 3
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/TIp3M on line 3
Process exited with code 255.