https://www.codewars.com/kata/5667e8f4e3f572a8f2000039

Mumbling.php

function accum($s) {
    $result = array();
    for ($i = 0; $i < strlen($s); $i++) {
        $str = "";
        for ($j = 0; $j <= $i; $j++) {
            $str =  $str . $s[$i];
        }
        $result[] = ucfirst(strtolower($str));
    }
    return implode("-", $result);
}