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run code in 200+ php & hhvm versions
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<?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 - 7.2.0