如何在 PHP 中从具有 2 个计数的数组创建 2 个集合？答案

【问题标题】：How to create 2 collections based from an array with 2 count in PHP?如何在 PHP 中从具有 2 个计数的数组创建 2 个集合？
【发布时间】：2021-10-16 09:11:31
【问题描述】：

我知道这是一个基本问题，很抱歉我无法回答，但是如何在 Laravel/PHP 中从具有 2 个值的数组创建 2 个集合？这是我的代码：

 $received_items = ReceiveItems::where('voucher_id', '=', $request->voucher_id)->get();
        foreach($received_items as $received_item) {
            $product_ids = $received_item->product_id;
            foreach($product_ids as $product_item_no => $product_id) {
                $products = Product::where('id', '=', $product_id); 
                $voucher_cost = $products->value('cost');
                $qty_addend = $received_item->qty_per_item;

                $list = array(
                    'product_item_no' => $product_item_no + 1,
                    'product_name' => $products->value('name'),
                    'size' => $products->value('size'),
                    'qty_addend' => $qty_addend[$product_item_no],
                    'voucher_cost' => $voucher_cost,
                    'ext_cost' => number_format($voucher_cost * $qty_addend[$product_item_no], 2)
                );

                $list = (object)$list;
                $received_item->list = $list;
                $data = collect([$list]);
            }
        }
        return $data;

基本上，$product_ids 是我想要获取的数组，count($product_ids) 返回2，但它只是从第二个数组值创建集合。请看下面的截图：

screenshot.png

非常感谢任何帮助。

【问题讨论】：

标签： php arrays laravel loops collections

【解决方案1】：

在您的$list 变量中，它只会存储最后一个product_id 数据，因为您必须将$list 作为多维数组。您必须将$list 变量从第二个循环中取出，这样它就不会覆盖数据。

试试下面的代码：

$received_items = ReceiveItems::where('voucher_id', '=', $request->voucher_id)->get();
foreach($received_items as $received_item) {
   $product_ids = $received_item->product_id;
   $list = []; // declare list variable here
   foreach($product_ids as $product_item_no => $product_id) {
       $products = Product::where('id', '=', $product_id);
       $voucher_cost = $products->value('cost');
       $qty_addend = $received_item->qty_per_item;

       $list[] = array( // make it multi-dimentional array
           'product_item_no' => $product_item_no + 1,
           'product_name' => $products->value('name'),
           'size' => $products->value('size'),
           'qty_addend' => $qty_addend[$product_item_no],
           'voucher_cost' => $voucher_cost,
           'ext_cost' => number_format($voucher_cost * $qty_addend[$product_item_no], 2)
       );
   }
   // take this code out of loop
   $list = (object)$list;
   $received_item->list = $list;
   $data = collect([$list]);
}
return $data;

【讨论】：