3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = array(0 => 100, "color" => "red"); $keys = array_keys($array); print_r($keys[2]); ?>
based on s6jgh
Output for 5.3.0 - 7.2.0
Notice: Undefined offset: 2 in /in/19QPf on line 6
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 2 in /in/19QPf on line 6