根据两列值和每一组中一列的和值对多维数组数据进行分组

问题描述

我有一个数组，它是来自两个不同数据库的两个数据库查询的组合，它看起来类似于:

I have an array which is created as a combination of two database queries from two separate databases, it looks similar to:

$arr1 = [
    ['part' => '1', 'address' => 'aaa', 'type' => '1', 'count' => 5],
    ['part' => '1', 'address' => 'bbb', 'type' => '1', 'count' => 5],
    ['part' => '1', 'address' => 'ccc', 'type' => '1', 'count' => 5],
    ['part' => '2', 'address' => 'aaa', 'type' => '1', 'count' => 5],
    ['part' => '2', 'address' => 'bbb', 'type' => '1', 'count' => 5],
    ['part' => '2', 'address' => 'ccc', 'type' => '2', 'count' => 5]
];

我正在寻找一种根据 part 和 type 值对数组进行分组的方法.我还需要知道分组的 count 值的总数.

I am looking for a way to group this array by part and type values. I also need to know the total of the count values as they are grouped.

结果将类似于:

$arr2 = [
    ['part' => '1', 'type' => '1', 'count' => 15],
    ['part' => '2', 'type' => '1', 'count' => 10],
    ['part' => '2', 'type' => '2', 'count' => 5]
];

但是我只是看不到该怎么做.我已经看到了几个按单个键/值进行分组的示例，但不能一次按多个值进行分组.

but I just can't see how to do this. I have seen a few examples of grouping by a single key/value, but not by multiple values at once.

推荐答案

此功能可以完成这项工作.

This function should do the job.

function groupByPartAndType($input) {
  $output = Array();

  foreach($input as $value) {
    $output_element = &$output[$value['part'] . "_" . $value['type']];
    $output_element['part'] = $value['part'];
    $output_element['type'] = $value['type'];
    !isset($output_element['count']) && $output_element['count'] = 0;
    $output_element['count'] += $value['count'];
  }

  return array_values($output);
}

如果两个数据库都在同一台数据库服务器上，则可以使用SQLs GROUP BY 功能来做到这一点.

If both databases are on the same database server you would be able to do this using SQLs GROUP BY feature.

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