3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 'c'; print $a ?? 'b'; print "\n";
based on kmcJg
Output for hhvm-3.15.4, 7.0.0 - 7.3.1
c
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/T3umT on line 5
Process exited with code 255.