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 hhvm-3.11.1 - 3.22.0, 7.0.0 - 7.3.0
int(1)
Output for hhvm-3.10.1
Fatal error: syntax error, unexpected '?' in /in/qhAfs on line 4
Process exited with code 255.
Output for 5.3.21 - 5.6.38
Parse error: syntax error, unexpected '?' in /in/qhAfs on line 4
Process exited with code 255.