在 Laravel、Blade 或 PHP 中按键相加每个数组子项的总量

Posted 2023-03-14

【中文标题】在 Laravel、Blade 或 PHP 中按键相加每个数组子项的总量

【英文标题】：Adding up the total amount of each array child item by key in Laravel, Blade or PHP

【发布时间】：2017-07-03 02:16:50

【问题描述】：

我正在尝试将每个收据/父母每个 receiptitems->value 的总金额相加。

理想的结果是循环显示收据；

receipt->id 
receipt->merchant
receipt->totalValue

每个子值的总值（即整个收据值）。

示例 JSON 输出：

[  
     
      "id":1,
      "user_id":1,
      "image":"58a31ba406d16.jpg",
      "merchant":"Tesco",
      "created_at":"2016-04-23 22:02:58",
      "receiptitems":[  
           
            "receipt_id":1,
            "category_id":2,
            "value":5285
         ,
           
            "receipt_id":1,
            "category_id":5,
            "value":5231
         ,
           
            "receipt_id":1,
            "category_id":5,
            "value":6822
         
      ]
   ,
     
      "id":2,
      "user_id":1,
      "image":"58a31ba4073c8.jpg",
      "merchant":"Tesco",
      "created_at":"2016-09-19 02:55:38",
      "receiptitems":[  
           
            "receipt_id":2,
            "category_id":2,
            "value":7009
         ,
           
            "receipt_id":2,
            "category_id":7,
            "value":2147
         
      ]
   ,
     
      "id":3,
      "user_id":1,
      "image":"58a31ba407a26.jpg",
      "merchant":"Tesco",
      "created_at":"2016-08-06 12:30:27",
      "receiptitems":[  
           
            "receipt_id":3,
            "category_id":7,
            "value":4598
         ,
           
            "receipt_id":3,
            "category_id":2,
            "value":8799
         ,
           
            "receipt_id":3,
            "category_id":3,
            "value":773
         
      ]
   ,
     
      "id":4,
      "user_id":1,
      "image":"58a31ba407e69.jpg",
      "merchant":"Tesco",
      "created_at":"2016-12-10 21:21:43",
      "receiptitems":[  
           
            "receipt_id":4,
            "category_id":5,
            "value":883
         ,
           
            "receipt_id":4,
            "category_id":5,
            "value":3013
         ,
           
            "receipt_id":4,
            "category_id":2,
            "value":1013
         ,
           
            "receipt_id":4,
            "category_id":1,
            "value":3243
         
      ]
   ,
     
      "id":5,
      "user_id":1,
      "image":"58a31ba408187.jpg",
      "merchant":"Tesco",
      "created_at":"2017-01-18 14:12:16",
      "receiptitems":[  
           
            "receipt_id":5,
            "category_id":7,
            "value":1355
         ,
           
            "receipt_id":5,
            "category_id":1,
            "value":1547
         ,
           
            "receipt_id":5,
            "category_id":1,
            "value":1640
         ,
           
            "receipt_id":5,
            "category_id":1,
            "value":2466
         ,
           
            "receipt_id":5,
            "category_id":8,
            "value":2689
         
      ]
   
]

我一直在尝试使用控制器以及刀片模板，但无法获得所需的结果。我一直在看 array_sum() http://php.net/manual/en/function.array-sum.php 但我不确定如何实现它。

我已经在 RecriptsController 中尝试过：

$receipts = Receipt::where('user_id', Auth::id())
    ->with('receiptitems')
    ->get();

foreach ($receipts as $receipt) 
    $result = array_sum($receipt->receiptitems->value);
;

return $result;

而且在 Blade 模板中：

@foreach($receipts as $receipt)
    <li> $receipt->merchant </li>
    <ul>
    @foreach($receipt->receiptitems as $item)
        <li> array_sum($item->value) </li>
    @endforeach
    </ul>
@endforeach

【参考方案1】：

通常，您希望array_column 与array_sum 结合使用：

foreach ($receipts as $receipt) 
    $total = array_sum(array_column($receipt['receiptitems'], 'value'));
    print_r($total);

array_column 从receiptitems 子数组中取出value 键。然后array_sum 将这些加起来。但是你有一个对象的集合，所以你实际上需要一个基于array_map的稍微不同的方法：

foreach ($receipts as $receipt) 
    $total = array_sum(array_map(function ($o)  return $o->value; , $receipt->receiptitems));
    print_r($total);

顺便说一句，您可能需要考虑一个Receipt::getTotalAttribute() mutator，它将返回项目的总数并简化您与模型交互的方式。

【讨论】：

感谢您的回答。我收到 array_column() expects parameter 1 to be array, object given 错误

听起来像一个集合。也许您想使用(array) 将其转换为数组，或者使用->toArray() 或等效的转换方法。

我在循环之外添加了return $total->toArray();，但我仍然得到同样的错误（参考你的例子中的第二行）。

【参考方案2】：

虽然问题得到了回答，我得到了我想要的结果。一位朋友帮助我选择了另一个也有效的选项（收藏）：

public function index()

    $receipts = Receipt::where('user_id', Auth::id())
        ->with('receiptitems')
        ->get();

    $collection = collect($receipts);
    $data = $collection->map(
        function($receipt) 
            $r = new stdClass;
            $r->id = $receipt->id;
            $r->merchant = $receipt->merchant;
            $r->amount = collect($receipt->receiptitems)->pluck('value')->sum();
            $r->date = $receipt->date;
            return $r;
        
    );

    return view('transactions', compact('data'));

希望对其他人有所帮助。