Question

下面是我的数组：

Array
(
    [0] => Array
        (
            [transaction_id] => 1 
            [branch_id] => 4
            [total] => 2254.35
        )

    [1] => Array
        (
            [transaction_id] => 1  
            [branch_id] => 4
            [total] => 31989.2
        )

    [2] => Array
        (
            [transaction_id] => 3  
            [branch_id] => 5
            [total] => 2109.71
        )

    [3] => Array
        (
            [transaction_id] => 1  
            [branch_id] => 4
            [total] => 200
        )

    [4] => Array
        (
            [transaction_id] => 1  
            [branch_id] => 4
            [total] => 200
        )

    [5] => Array
        (
            [transaction_id] => 2  
            [branch_id] => 6
            [total] => 550
        )

    [6] => Array
        (
            [transaction_id] => 2  
            [branch_id] => 6
            [total] => 550
        )

    [7] => Array
        (
            [transaction_id] => 1  
            [branch_id] => 4
            [total] => 400
        )

)

正如您所看到的，有多个具有相同键和相同值的数组。现在，我想合并transaction_id键中具有相同值的数组。新阵列将是这样的：

Array
(
    [0] => Array
        (
            [transaction_id] => 1  
            [branch_id] => 4 //always replace this element
            [total] => 35043.55 //always sum this element(i.e. 2254.35 + 31989.2 + 200 + 200 + 400)
        )

    [1] => Array
        (
            [transaction_id] => 3  
            [branch_id] => 5
            [total] => 2109.71
        )

    [2] => Array
        (
            [transaction_id] => 2  
            [branch_id] => 6
            [total] => 1100 //i.e. 550 + 550
        )

)

我该怎么做。我尝试使用array_merge_recursive()，但没有运气。

Answer 1

我有类似的任务要做，你真的必须为它做一个自定义代码。我有一些简单的循环

$new_array=array();
Foreach ($array as $key=>$value) {
    if (isset($new_array[$value[transaction_id]]){
      //add sum and what you want to do 
    }else{
       //add new record
    }
}

这不是最好的，但它会做你想要的并且不要忘记unset()使用的行来保存数据

Answer 2

简单，但诀窍。（见评论）

$transactions = [
    [
        'transaction_id' => 1,
        'branch_id' => 4,
        'total' => 200,
    ],
    [
        'transaction_id' => 1,
        'branch_id' => 4,
        'total' => 200,
    ],
    [
        'transaction_id' => 2,
        'branch_id' => 4,
        'total' => 200,
    ],
    [
        'transaction_id' => 3,
        'branch_id' => 4,
        'total' => 200,
    ],
    [
        'transaction_id' => 1,
        'branch_id' => 4,
        'total' => 200,
    ],
    [
        'transaction_id' => 1,
        'branch_id' => 4,
        'total' => 200,
    ],
];

$merged = [];

foreach($transactions as $singleTransaction){
    // Group via transaction_id and clone it for base data //
    if(empty($merged[$singleTransaction['transaction_id']])){
        $merged[$singleTransaction['transaction_id']] = $singleTransaction;
    } else {
        // Add up the totals of duplicate transaction_ids //
        $merged[$singleTransaction['transaction_id']]['total'] += $singleTransaction['total'];
    }
}

Answer 3

我的直观解决方案：

$arr = Array
(
    0 => Array
    (
        'transaction_id' => 1,
            'branch_id' => 4,
            'total' => 2254.35
        ),

    1 => Array
(
    'transaction_id' => 1,
            'branch_id' => 4,
            'total' => 31989.2
        ),
    2 => Array
(
    'transaction_id' => 3,
            'branch_id' => 5,
            'total' => 2109.71
        ),
    3 => Array
(
    'transaction_id' => 1,
            'branch_id' => 4,
            'total' => 200
        ),
    4 => Array
(
    'transaction_id' => 1,
            'branch_id' => 4,
            'total' => 200
        ),
    5 => Array
(
    'transaction_id' => 2,
            'branch_id' => 6,
            'total' => 550
        ),
    6 => Array
(
    'transaction_id' => 2,
            'branch_id' => 6,
            'total' => 550
        ),
    7 => Array
(
    'transaction_id' => 1,
            'branch_id' => 4,
            'total' => 400
        )
);

$transactionMap = [];
foreach ($arr as $item) {
    $currentTransaction = $transactionMap[$item['transaction_id']];
    $currentTransaction['branch_id'] = $item['branch_id'];
    $currentTransaction['total'] = (isset($currentTransaction['total'])?$currentTransaction['total']:0)+$item['total'];
    $transactionMap[$item['transaction_id']] = $currentTransaction;
}

Answer 4

试试这个

$aTmp = array();
$aData = ...your data array..
$aRes = array();

foreach ($aData as $row) {
    if (!isset($aTmp[$row['transaction_id']])) {
        $aTmp[$row['transaction_id']] = $row;
    } else {
        $aTmp[$row['transaction_id']]['branch_id'] = $row['branch_id'];
        $aTmp[$row['transaction_id']]['total'] += $row['total'];
    }
}

$aRes = array_values($aTmp);
var_dump($aRes);

Answer 5

假设所有数组都已准备好合并并嵌套在一个主数组中

定义临时数组以保存计算结果

$allArrays = [...]; // nest all arrays here
$matchedArrays = [];
foreach($allArrays as $id=>$toMerge) {
   foreach($toMerge as $iid=>$data) {
      if(isset($matchedArrays[$data['transaction_id']])) {
         // process merging here
         $matchedArrays[$data['transaction_id']] = [
            'transaction_id' => $data['transaction_id'],  
            'branch_id' => $data['branch_id'],
            'total' => $matchedArrays[$data['transaction_id']]['total'] + $data['total'],
         ];
      } else {
         $matchedArrays[$data['transaction_id']] = $data;
      }
   }  
}

//结果数组将具有事务ID作为其键和合并的关联值

如何以相同的键递归合并数组？

5 个答案: