3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo $a ?? 'b';
based on V0HgR
Output for 7.0.0 - 7.2.0
b
Output for 5.3.18 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/nlhqC on line 2
Process exited with code 255.