3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $f = array(1,2,3,4,5,6,7,8,9,10); foreach($f as $k => $v) { echo $k; if($k == 4) $k = 8; }
Output for 4.3.0 - 7.1.0
0123456789