php根据二维数组中的某一元素相等，另一个元素相加

最新推荐文章于 2022-01-05 16:04:47 发布

转载最新推荐文章于 2022-01-05 16:04:47 发布 · 488 阅读

本文介绍了一种处理二维数组的方法，通过遍历数组并根据特定条件（area相同）将count字段进行累加，最终生成一个新的数组。这种方法适用于数据聚合场景，能够有效减少数组元素数量，同时保留关键统计数据。

二维数组：$taskData

Array
(
    [0] => Array
        (
            [area] => 1
            [winsFlag] => 7
            [count] => 3
        )

    [1] => Array
        (
            [area] => 1
            [winsFlag] => 3
            [count] => 2
        )

    [2] => Array
        (
            [area] => 1
            [winsFlag] => 5
            [count] => 2
        )

    [3] => Array
        (
            [area] => 2
            [winsFlag] => 6
            [count] => 2
        )

    [4] => Array
        (
            [area] => 2
            [winsFlag] => 3
            [count] => 2
        )

    [5] => Array
        (
            [area] => 3
            [winsFlag] => 7
            [count] => 3
        )

    [6] => Array
        (
            [area] => 3
            [winsFlag] => 1
            [count] => 1
        )

    [7] => Array
        (
            [area] => 4
            [winsFlag] => 2
            [count] => 1
        )

    [8] => Array
        (
            [area] => 4
            [winsFlag] => 2
            [count] => 1
        )

)

根据area相同将count相加

    $item=[];
    foreach($taskData as $k=>$v){
       if(!isset($item[$v['area']])){
            $item[$v['area']] = $v;
       }else{
           $item[$v['area']]['count'] += $v['count'];
       }

结果：得到一个新的数组 $item

    Array
    (
        [1] => Array
            (
                [area] => 1
                [winsFlag] => 7
                [count] => 7
            )

        [2] => Array
            (
                [area] => 2
                [winsFlag] => 6
                [count] => 4
            )

        [3] => Array
            (
                [area] => 3
                [winsFlag] => 7
                [count] => 4
            )

        [4] => Array
            (
                [area] => 4
                [winsFlag] => 2
                [count] => 2
            )

    )