3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump('' ?? 'foo'); var_dump('' ? '' : 'foo');
Output for hhvm-3.15.4, 7.0.0 - 7.3.0beta1
string(0) "" string(3) "foo"
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected '?' in /in/s3vlG on line 3
Process exited with code 255.