3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $ar = array(1,6,2,9,3,0,5,7,4); sort($ar); $count = count($ar); foreach ($ar as $index => $val) { if ($index != $val) { echo $index; } }
based on Wl8Lp
Output for 4.3.0 - 7.1.0
8