3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php // $a is not set $b = 16; echo $a ?? 2 . "\n"; // outputs 2 echo $a ?? $b ?? 7 . "\n"; // outputs 16
based on Z7irZ
Output for 7.0.0 - 7.2.0
2 16
Output for 5.3.18 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/F89ai on line 6
Process exited with code 255.