3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = NULL; $c = 1; $d = $a ?? $b ?? $c; var_dump($d);
Output for 7.0.0 - 7.2.0
int(1)
Output for 5.3.21 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/qhAfs on line 4
Process exited with code 255.