数组示例：
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1
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[0] => array(3) { ["id"] => string(1 "1" ["name"] => string(4) "jhon" ["amount"] => string(3) "850" } [1] => array(3) { ["id"] => string(1) "2" ["name"] => string(5) "david" ["amount"] => string(4) "1200" } [2] => array(3) { ["id"] => string(1) "3" ["name"] => string(4) "lucy" ["amount"] => string(3) "200" }
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需求说明：计算数组中所有元素的amount项的和。
方法一：
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1
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$total = array_sum(array_map(function($val){return $val['amount'];}, $arr));
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方法二：
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1
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$total = 0; foreach($arr as $item){ $total += (int) $item['amount']; }
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未经允许不得转载：主机百科 » php计算二维数组中某一项之和的方法
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