3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 0; $a ?? 1; echo $a;
based on I0UQO
Output for hhvm-3.15.4, 7.0.0 - 7.3.0rc3
0
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/iojGn on line 4
Process exited with code 255.