3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 1; $b = 16; echo $a ?? $b ?? 7;
Output for hhvm-3.15.4, 7.0.0 - 7.3.1
1
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/5dMMi on line 6
Process exited with code 255.