3v4l.org

run code in 300+ PHP versions simultaneously
<?php $h = explode("|", strrev($b)); $d = explode("*", $h[0]); $b = $h[1]; for($i=0;$i<sizeof($d);$i++) { $b = str_replace($i, $d[$i], $b); } echo $b;

preferences:
35.35 ms | 402 KiB | 5 Q