3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array('l' => 'foo'); var_dump(isset($a[null])); var_dump(isset($a['4'])); var_dump(isset($a['l']));
Output for 4.3.0 - 7.2.0
bool(false) bool(false) bool(true)