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[0]); echo $keys; ?>
based on IGuoW
Output for 5.4.0 - 7.2.0
Notice: Array to string conversion in /in/8IJ10 on line 6 Array
Output for 4.3.0 - 5.3.29
Array