3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $data = get_defined_constants();foreach ($data as $constant => $value) { $flag = ! is_scalar(constant($constant)) && ! is_resource(constant($constant)) && constant($constant) !== null; if ($flag) { echo $constant; }}
based on OiiUR
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0