codeigniter foreach 具有相同 ID 的多个条目，对元素求和并显示为一个

Question

我使用 foreach 使用来自“销售”行 json_decode($row['sale']) 的数据制作表格，现在分别显示每个条目，我想要做的是将具有相同 ID [product_id] 的每个条目显示为一个并将 [num ], sum [product_pcs], sum [price_per_pcs] 所有具有相同id的条目并显示一行。

json_decode($row['sale']):

Array ( [0] => stdClass Object ( [stock_id] => 501 [product_id] => 7 [product_pcs] => 1120 [price_per_pcs] => 1.17 [num] => 1) [1] => stdClass Object ( [stock_id] => 500 [product_id] => 7 [product_pcs] => 1120 [price_per_pcs] => 1.17 [num] => 1 ) [2] => stdClass Object ( [stock_id] => 497 [product_id] => 3 [product_pcs] => 600 [price_per_pcs] => 1,1 [num] => 1 ) [3] => stdClass Object ( [stock_id] => 496 [product_id] => 3 [product_pcs] => 600 [price_per_pcs] => 1,1 [num] => 1 ) [4] => stdClass Object ( [stock_id] => 526 [product_id] => 25 [product_pcs] => 1120 [price_per_pcs] => 1.22 [num] => 1 ) [5] => stdClass Object ( [stock_id] => 525 [product_id] => 7 [product_pcs] => 1120 [price_per_pcs] => 1.17 [num] => 1 ) )

我这样显示接收到的数据：

<table>
<thead>
                        <tr>
                            <th>No</th>
                            <th>Product ID</th>
                            <th>Price Per Piece</th>
                            <th>Product pcs</th>
                            <th>Total products</th>
                    <?php 
                        $count      =   1;
                        $sale   = json_decode($row['sale']);
                        foreach ($sale as $product):
                    ?>
                        </tr>
 </thead>
  <tbody> 
   <tr>
                            <td><?php echo $count++;?>.</td>
                            <td><?php echo $product->product_id; ?></td>
                            <td><?php echo $product->price_per_pcs;?></td>
                            <td><?php echo $product->product_pcs; ?></td>
                            <td><?php echo $product->num; ?></td>
                        </tr>
                    <?php endforeach;?>
</tbody> 
</table>

通过以上内容，我得到了一个如下所示的表格：
我想看起来像这样：

我将不胜感激。

Answer 1

最好的方法是更改​​原始 SQL 查询，但由于目前缺少该信息，您可以创建一个包含所需总和的新数组，例如：

<table>
<thead>
    <tr>
        <th>No</th>
        <th>Product ID</th>
        <th>Price Per Piece</th>
        <th>Product pcs</th>
        <th>Total products</th>
    </tr>
 </thead>
 <tbody>

    <?php 
    $sale = json_decode($row['sale']);

    $sum = array(); // INITIATE NEW ARRAY WITH SUMS

    //  SUM UP VALUES IN A NEW ARRAY...
    foreach ($sale as $product){ 
        // CHECK IF ITEM IS SET TO PREVENT "Undefined offset" ERRORS... 
        if (!isset($sum[$product->product_id])) { 
            // INITIATE ARRAYS.. THE PRODUCT ID IS USED AS ARRAY KEY 
            $sum[$product->product_id]['price_per_pcs'] = $product->price_per_pcs;
            $sum[$product->product_id]['product_pcs'] = $product->product_pcs;
            $sum[$product->product_id]['product_num'] = $product->num;       
        } else { // ARRAYS ALREADY SET.. USE ASSIGNMENT OPERATORS TO SUM UP THE VALUES
            $sum[$product->product_id]['price_per_pcs'] += $product->price_per_pcs;
            $sum[$product->product_id]['product_pcs'] += $product->product_pcs;
            $sum[$product->product_id]['product_num'] += $product->num;
        } 
    }

    // LOOP THROUGH SUMS ARRAY...   
    $count = 1;
    foreach ($sum as $key=>$val){
    ?>
   <tr>
        <td><?php echo $count++;?>.</td>
        <td><?php echo $key; ?></td>
        <td><?php echo $val['price_per_pcs'];?></td>
        <td><?php echo $val['product_pcs']; ?></td>
        <td><?php echo $val['product_num']; ?></td>
    </tr>
<?php } ;?>
</tbody> 
</table>

让我知道这是否适合您.. 或者我是否可以为您提供任何其他解决方案。