3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = null; $b = 1; var_dump(isset($a),isset($b));
based on 6PF2q
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true)