3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $var = false; var_dump($var === null, is_null($var), isset($var), null === $var, false === $var, empty($var));
based on BvRDa
Output for 4.3.0 - 7.1.0
bool(false) bool(false) bool(true) bool(false) bool(true) bool(true)