3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump($a['a'] ?? 'no');
based on voide
Output for hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc3
string(2) "no"
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/K9fWt on line 3
Process exited with code 255.