3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $b = 2; $d = 4; echo $a ?? $b ?? $c ?? $d;
based on guBCa
Output for 7.0.0 - 7.2.0
2
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/YcI88 on line 6
Process exited with code 255.