3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $nonexistant = ''; $value = $nonexistent ?? 'default'; var_dump($value);
based on 9pZ2L
Output for 7.0.0 - 7.2.0
string(7) "default"
Output for 5.4.0 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/hWMZS on line 3
Process exited with code 255.