3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $s = []; var_dump($s['test'] ?? null);
Output for hhvm-3.11.1 - 3.22.0, 7.0.0 - 7.3.0
NULL
Output for hhvm-3.10.1
Fatal error: syntax error, unexpected '?' in /in/ln7dU on line 4
Process exited with code 255.
Output for 5.4.9 - 5.6.38
Parse error: syntax error, unexpected '?' in /in/ln7dU on line 4
Process exited with code 255.
Output for 5.3.19 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ln7dU on line 3
Process exited with code 255.