3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo; $bar = 2; echo($foo ?? $bar);
Output for 7.0.0 - 7.3.1
2
Output for 5.3.20 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/2XBJ2 on line 4
Process exited with code 255.