Php 根据条件结果在foreach循环中增加计数器

我有一个从mysql查询生成的数组，如下所示。它们的键是

order\u id

值

订单数组

Array
(
    [2646] => Array
        (
            [order_id] => 2646
        )

    [2647] => Array
        (
            [order_id] => 2647
        )

    [2650] => Array
        (
            [order_id] => 2650
        )

    [2658] => Array
        (
            [order_id] => 2658
        )

)

Array
(
    [0] => Array
        (
            [order_id] => 2646
            [prod_code] => 2811
            [order_qty] => 1
        )

    [1] => Array
        (
            [order_id] => 2646
            [prod_code] => 2812A
            [order_qty] => 3
        )

    [2] => Array
        (
            [order_id] => 2647
            [prod_code] => 2812A
            [order_qty] => 2
        )

    [3] => Array
        (
            [order_id] => 2647
            [prod_code] => 2810
            [order_qty] => 2
        )

    [4] => Array
        (
            [order_id] => 2650
            [prod_code] => 2906
            [order_qty] => 1
        )

    [5] => Array
        (
            [order_id] => 2650
            [prod_code] => 2908
            [order_qty] => 6
        )

    [6] => Array
        (
            [order_id] => 2650
            [prod_code] => 2909
            [order_qty] => 3
        )

    [7] => Array
        (
            [order_id] => 2650
            [prod_code] => 2913
            [order_qty] => 1
        )

    [8] => Array
        (
            [order_id] => 2658
            [prod_code] => 2880
            [order_qty] => 3
        )

    [9] => Array
        (
            [order_id] => 2658
            [prod_code] => 2881
            [order_qty] => 3
        )

    [10] => Array
        (
            [order_id] => 2658
            [prod_code] => 2882
            [order_qty] => 1
        )

)

我正在考虑向数组的每一行添加项目，其中包含来自另一个数组的项目，看起来像

订单项目数组

Array
(
    [2646] => Array
        (
            [order_id] => 2646
        )

    [2647] => Array
        (
            [order_id] => 2647
        )

    [2650] => Array
        (
            [order_id] => 2650
        )

    [2658] => Array
        (
            [order_id] => 2658
        )

)

Array
(
    [0] => Array
        (
            [order_id] => 2646
            [prod_code] => 2811
            [order_qty] => 1
        )

    [1] => Array
        (
            [order_id] => 2646
            [prod_code] => 2812A
            [order_qty] => 3
        )

    [2] => Array
        (
            [order_id] => 2647
            [prod_code] => 2812A
            [order_qty] => 2
        )

    [3] => Array
        (
            [order_id] => 2647
            [prod_code] => 2810
            [order_qty] => 2
        )

    [4] => Array
        (
            [order_id] => 2650
            [prod_code] => 2906
            [order_qty] => 1
        )

    [5] => Array
        (
            [order_id] => 2650
            [prod_code] => 2908
            [order_qty] => 6
        )

    [6] => Array
        (
            [order_id] => 2650
            [prod_code] => 2909
            [order_qty] => 3
        )

    [7] => Array
        (
            [order_id] => 2650
            [prod_code] => 2913
            [order_qty] => 1
        )

    [8] => Array
        (
            [order_id] => 2658
            [prod_code] => 2880
            [order_qty] => 3
        )

    [9] => Array
        (
            [order_id] => 2658
            [prod_code] => 2881
            [order_qty] => 3
        )

    [10] => Array
        (
            [order_id] => 2658
            [prod_code] => 2882
            [order_qty] => 1
        )

)

我在解决如何循环

order\u items

数组并将

prod\u code

和

order\u quantity

值插入

order

数组中

order\u id

值匹配时遇到的问题。这是我到目前为止所拥有的

// create orders array - key by order_id
while ($order = mysqli_fetch_assoc($order_rows)) {
    $orders[$order['order_id']] = $order;
}

// create the order_items array
while ($item = mysqli_fetch_assoc($item_rows)) {
    $order_items[] = $item;
}

// update orders array with ordered items
$item_index = 1;
foreach ($order_items as $key => $value) {

    // get the order id
    $item_order_id = $value['order_id'];

    // update orders array with ordered items grouped by order_id
    if ($item_order_id == $orders[$item_order_id]['order_id']) {
        $orders[$item_order_id]['prod_code_'.$item_index] = $value['prod_code'];
        $orders[$item_order_id]['order_qty_'.$item_index] = $value['order_qty'];

        // same order id so increment the counter
        $item_index++;

    } else {

        // new order id start at 1
        $item_index = 1;
    }

}

我的问题是，当我们查看新的

项目\u订单\u id

时，计数器没有重置回1

我试图为数组实现的输出是这样的

所需订单数组输出

Array
(
    [2646] => Array
        (
            [order_id] => 2646
            [prod_code_1] => 2811
            [order_qty_1] => 1
            [prod_code_2] => 2812A
            [order_qty_2] => 3
        )

    [2647] => Array
        (
            [order_id] => 2647
            [prod_code_1] => 2812A
            [order_qty_1] => 2
            [prod_code_2] => 2810
            [order_qty_2] => 2
        )

    [2650] => Array
        (
            [order_id] => 2650
            [prod_code_1] => 2906
            [order_qty_1] => 1
            [prod_code_2] => 2908
            [order_qty_2] => 6
            [prod_code_3] => 2909
            [order_qty_3] => 3
            [prod_code_4] => 2913
            [order_qty_4] => 1
        )

    [2658] => Array
        (
            [order_id] => 2658
            [prod_code_1] => 2880
            [order_qty_1] => 3
            [prod_code_2] => 2881
            [order_qty_2] => 3
            [prod_code_3] => 2882
            [order_qty_3] => 1
        )

)

非常感谢您的反馈或帮助。

您可以通过以下两个步骤：

按订单id聚合订单项

构建最终输出

第一关 第二关

---

[prod\u code\u 1]

，

[prod\u code\u 2]

。。。。哎哟。。。。为什么不

[prod_code]=>数组（2906290829092913）

？最终的数组将保存到文本文件（csv）中，这是第三方应用程序要求结构化数据的格式。