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@ 2017-12-07T08:48:07Z

<?php

$input = "9121221212119";


$calculate = function($input) {
    $sum = 0;
    $previousChar = $input[strlen($input) - 1];
    foreach(str_split($input) as $char) {
        if ($char === $previousChar) {
            $sum += (int)$char;
        }
        $previousChar = $char;
    }
    return $sum;
};

var_dump($calculate($input));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
str_split: documentation ( source)

preferences:dark modelive preview

56.26 ms | 402 KiB | 5 Q