3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x[0] = 'ser'; echo $x[0][0] ?? $x;
Output for hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc3
s
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/SNRab on line 5
Process exited with code 255.