3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo ?? $foo;
Output for 7.0.0 - 7.2.0
Notice: Undefined variable: foo in /in/P3Nrp on line 3
Output for 5.3.21 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/P3Nrp on line 3
Process exited with code 255.