3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php namespace Foo; const true = false;
Output for hhvm-3.10.0 - 3.12.0
Output for 5.3.0 - 5.4.12
Fatal error: Cannot redeclare constant 'true' in /in/9jWIv on line 4
Process exited with code 255.