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aiwas/mod10w3.php

Created March 4, 2019 08:15
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モジュラス10 ウェイト3 の再発明
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mod10w3.php
<?php
function mod10w3(string $numeric) {
$num_array = array_reverse(str_split($numeric));
$sum_odd = array_sum(array_map('current', array_chunk(array_slice($num_array, 0), 2)));
$sum_even = array_sum(array_map('current', array_chunk(array_slice($num_array, 1), 2)));
$sum_all = ($sum_odd * 3) + $sum_even;
$mod = $sum_all % 10;
$cd = ($mod == 0) ? 0 : (10 - $mod);
return $cd;
}
?>
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