gistfile1.php

    $total  = ($origCount * $origRating) + $rating;
    $number = $origCount + $count;
    if ($number > 0) {
        $origRating = $total / $number;
        $origCount  = $number;
        return [$origRating, $origCount];
    } else {
        $origRating = 0;
        $origCount  = 0;
        return [$origRating, $origCount];
    }