My entry XD

<?php function rotencode($string, $amount) {
    $key = substr($string, 0, 1);
    if (strlen($string) == 1) {
        return chr(ord($key) + $amount);
    } else {
        return chr(ord($key) + $amount) . rotEncode(substr($string, 1, strlen($string) - 1), $amount);
    }
}
if (!function_exists("rotencode")) {
    function rotencode($string, $amount) {
        $key = substr($string, 0, 1);
        if (strlen($string) == 1) {
            return chr(ord($key) + $amount);
        } else {
            return chr(ord($key) + $amount) . rotEncode(substr($string, 1, strlen($string) - 1), $amount);
        }
    }
}