Php 逐数组计算数组

是否可以逐个数组计算数组

例如，按每个

[group]

计算

[num]

和

[price]

的总和

Array
(
    [0] => Array
        (
            [group] => Apple
            [num] => 5
            [price] => 10
        )

    [1] => Array
        (
            [group] => Apple
            [num] => 2
            [price] => 8
        )

    [2] => Array
        (
            [group] => Orange
            [num] => 4
            [price] => 6
        )

    [3] => Array
        (
            [group] => Orange
            [num] => 12
            [price] => 24
        )

)

结果是：

Array
(
    [0] => Array
        (
            [group] => Apple
            [num] => 7
            [price] => 18
        )

    [1] => Array
        (
            [group] => Orange
            [num] => 16
            [price] => 30
        )
)

---

简单循环和关联数组将完成此任务：

$result = Array();
foreach($array as $row) {
   if(!isset($result[ $row['group'] ])) {
       $result[ $row['group'] ] = $row;
       continue ;
   }
   $result[ $row['group'] ]['num'] += $row['num'];
   $result[ $row['group'] ]['price'] += $row['price'];
}
$result = array_values($result);

使用

数组\u reduce（）

：

---

循环数组并求和。如果此值来自表，则必须在获取它时进行计算。

$reduced = array_reduce($array, function(&$result, $item){
    $result[$item['group']]['num'] += $item['num'];
    $result[$item['group']]['price'] += $item['price'];
    return $result;
});