3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo = $bar ?? 'foo'; echo $foo;
based on 2gVM8
Output for 7.0.0 - 7.2.0
foo
Output for 5.3.20 - 5.6.21
Parse error: syntax error, unexpected '?' in /in/NmK5C on line 3
Process exited with code 255.