3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo = $_SERVER['PHP_AUTH_USER'] ?? false; var_dump($foo);
Output for 7.0.0 - 7.2.0
bool(false)
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/1E6qu on line 3
Process exited with code 255.