3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class P {} $x = function(P $p = null) { $t = $p ?? 'lol'; var_dump($t); }; $x();
Output for hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(3) "lol"
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/CCIPS on line 6
Process exited with code 255.