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 CRAP
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CheckDigit
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 modulus10wait3
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<?php
namespace Puyo\Calc;
/**
 * CheckDigit 算出
 */
class CheckDigit
{
    /**
     * @param string|int $num
     * @return string check digit
     */
    public static function modulus10wait3($num) {
        $chars = array_reverse(str_split($num));
        $numOfChars = count($chars);
        $total = 0;
        for($i=0; $i<$numOfChars; $i++) {
            $total += ( ($i+1) % 2) == 0 ? intval($chars[$i]) : intval($chars[$i])*3;
        }
        $totalLastChar = substr($total, strlen($total) - 1, 1);
        $intCd = 10 - intval($totalLastChar);
        if($intCd < 10) {
            return strval($intCd);
        } else {
            return '0';
        }
    }
}