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<?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 for git.master, git.master_jit, rfc.property-hooks
int(12)

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