3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $zero = 0; var_dump(isset($zero)); var_dump(empty($zero)); var_dump(is_null($zero));
based on JUj5a
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(true) bool(true) bool(false)