3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $nonexistent = null; $value = $nonexistent ?? 'default'; var_dump($value);
based on ZXqtn
Output for 7.0.0 - 7.2.0
string(7) "default"
Output for 5.3.18 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/YN0Q2 on line 3
Process exited with code 255.