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masakielastic/sum_product.php

Created January 15, 2012 01:16
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Excel の SUMPRODUCT 関数を PHP で定義
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sum_product.php
<?php
function sum_product($array, $array2) {
$ret = array_map(function($m, $n) { return $m * $n; }, $array, $array2);
// return array_sum($ret);
return array_reduce($ret, function($m, $n) { return $m + $n; }, 0);
}
var_dump(sum_product([100, 200, 300], [1, 2, 3])); // 1400
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