如何在 PHP 中按列对数组数据进行分组和求和以创建关联数组？

按列对数组数据进行分组，并对关联数组的另一列求和

给定一个数据数组，例如：

$array = [
    ['name' => 'Bank BRI', 'amount' => 0],
    ['name' => 'Bank BRI', 'amount' => 0],
    ['name' => 'Bank BCA', 'amount' => 1412341234],
    ['name' => 'Bank CIMB Niaga', 'amount' => 532532552],
    ['name' => 'Bank BRI', 'amount' => 34534534],
    ['name' => 'Bank CIMB Niaga', 'amount' => 453425243],
    ['name' => 'Bank BRI', 'amount' => 0],
    ['name' => 'Bank BNI', 'amount' => 124124],
    ['name' => 'Bank CIMB Niaga', 'amount' => 352345623],
    ['name' => 'Bank BCA', 'amount' => 23432423],
    ['name' => 'Bank Mandiri', 'amount' => 0],
    ['name' => 'Bank BCA', 'amount' => 0],
    ['name' => 'Bank BCA', 'amount' => 0],
    ['name' => 'Bank Permata', 'amount' => 352352353],
];

目标是根据“名称”列对数据进行分组并对数据求和每个组内的“金额”值形成一个平面关联数组。预期输出为：

array (
  'Bank BRI' => 34534534,
  'Bank BCA' => 1435773657,
  'Bank CIMB Niaga' => 1338303418,
  'Bank BNI' => 124124,
  'Bank Mandiri' => 0,
  'Bank Permata' => 352352353,
)

解决方案：

$bankTotals = array();
foreach ($array as $amount) {
  $bankTotals[$amount['name']] += $amount['amount'];
}

此代码初始化一个名为 $bankTotals 的空数组。然后它迭代输入数组，访问代表一行数据的每个子数组。对于每一行，它将“amount”值添加到 $bankTotals 数组中相应的“name”键。此过程有效地按“名称”对行进行分组，并相应地对“金额”值求和。

输出：

array (
  'Bank BRI' => 34534534,
  'Bank BCA' => 1435773657,
  'Bank CIMB Niaga' => 1338303418,
  'Bank BNI' => 124124,
  'Bank Mandiri' => 0,
  'Bank Permata' => 352352353,
)

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