如何在 PHP 中按列對數組資料進行分組和求和以建立關聯數組？

按列將數組資料分組，並將關聯數組的另一列求和

給定一個資料數組，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],
];

目標是根據「名稱」欄位對資料進行分組並對資料求和每個組內的「金額」值形成平面關聯數組。預期輸出為：

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

解：

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

此程式碼初始化一個名為 $bankTotals 的空數組。然後它迭代輸入數組，存取代表一行資料的每個子數組。對於每一行，它將“amount”值加到 $bankTotals 數組中相應的“name”鍵。此程序有效地以「名稱」對行進行分組，並相應地對「金額」值求和。

輸出：

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

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