Question

我正在创建一个电子商务网站，我必须提供商店在特定数组中的类别。目前，从mysql表中检索的数据在不同的数组项中包含相同的类别ID，如果数组具有不同的子类别，我必须在同一数组中收集相同的类别ID，并且子类别创建嵌套数组。代码在laravel 4.2上。这是现在的数据格式，

"data": [
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        "Dairy Whiteners"
      ],
      "total_items": 69
    },
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        "Tea & Coffee"
      ],
      "total_items": 69
    },
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        "Concentrates - Tang etc"
      ],
      "total_items": 69
    },
    {
      "id": 2,
      "name": "Beverages",
      "sub_category_names": [
        "Tea & Coffee"
      ],
      "total_items": 28
    },
    {
      "id": 2,
      "name": "Beverages",
      "sub_category_names": [
        "Concentrates - Tang etc"
      ],
      "total_items": 28
    }
  ]

这就是我需要的，

"data": [
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        "Dairy Whiteners" , "Concentrates - Tang etc" , "Tea & Coffee"
      ],
      "total_items": 69
    } ,

    {
      "id": 2,
      "name": "Beverages",
      "sub_category_names": [
        "Tea & Coffee" , "Concentrates - Tang etc"
      ],
      "total_items": 28
    }
  ]

我为上面写的代码，

// For the current categories create a common array for subcategories for same categories
        $filteringSelectedCategories = [];
        $subCategoriesNamesLocal = [];
        $innerIndex = 0;
        for ($i = 0; $i < count($selectedCategories); $i++) {

            // to prevent undefined offset error
            if (!isset($selectedCategories[$i + 1])) {
                continue ;
                // if 6 don't exist then deal with 5
            }
            // if the id of two items is same then push that sub category name in the same array
            if ($selectedCategories[$i]['id'] === $selectedCategories[$i + 1]['id']) {
                array_push($subCategoriesNamesLocal, $selectedCategories[$i]['sub_category_names']);
            } 
            // if the id is different then push the array values with the sub category name in an array 
            else {

                $filteringSelectedCategories[$innerIndex]['id'] = $selectedCategories[$i]['id'];
                $filteringSelectedCategories[$innerIndex]['name'] = $selectedCategories[$i]['name'];
                $filteringSelectedCategories[$innerIndex]['sub_category_names'] = $subCategoriesNamesLocal;
                $filteringSelectedCategories[$innerIndex]['total_items'] = $selectedCategories[$i]['total_items'];

                // nullify the array after assigning the value
                $subCategoriesNamesLocal = [];
                // increment the new array index
                $innerIndex = $innerIndex + 1;

            }
        }

以下是我从上面得到的输出，

"data": [
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        [
          "Dairy Whiteners"
        ],
        [
          "Tea & Coffee"
        ]
      ],
      "total_items": 69
    }
  ]

Answer 1

我不完全确定我会看到可能出现的偏移误差，但我相信你可以轻易逃脱;

foreach ($selectedCategories as $key => $data) {
    $newKey = $data['id'];
    $filteringSelectedCategories[$newKey]['id'] = $data['id'];
    $filteringSelectedCategories[$newKey]['name'] = $data['name'];
    $filteringSelectedCategories[$newKey]['sub_category_names'][] = $data['sub_category_names'];
    $filteringSelectedCategories[$newKey]['total_items'] = $data['total_items'];
}

Answer 2

您无法直接在$ subCategoriesNamesLocal中进行数组推送，因为您正在嵌套数组。在外面创建一个数组，然后将其连接到字段。

Answer 3

试试这个：

// For the current categories create a common array for subcategories for same categories
        $filteringSelectedCategories = [];
        $subCategoriesNamesLocal = [];
        $innerIndex = 0;
        for ($i = 0; $i < count($selectedCategories); $i++) {

            // to prevent undefined offset error
            if (!isset($selectedCategories[$i + 1])) {
                continue ;
                // if 6 don't exist then deal with 5
            }
            // if the id of two items is same then push that sub category name in the same array
            if ($selectedCategories[$i]['id'] === $selectedCategories[$i + 1]['id']) {
                array_push($subCategoriesNamesLocal, $selectedCategories[$i]['sub_category_names']);
            } 
            // if the id is different then push the array values with the sub category name in an array 
            else {

                $filteringSelectedCategories[$innerIndex]['id'] = $selectedCategories[$i]['id'];
                $filteringSelectedCategories[$innerIndex]['name'] = $selectedCategories[$i]['name'];
                $filteringSelectedCategories[$innerIndex]['sub_category_names'] = '"' . implode('","', $subCategoriesNamesLocal) . '"';

}
                $filteringSelectedCategories[$innerIndex]['total_items'] = $selectedCategories[$i]['total_items'];

                // nullify the array after assigning the value
                $subCategoriesNamesLocal = [];
                // increment the new array index
                $innerIndex = $innerIndex + 1;

            }
        }

解析多维数组php中的项目

3 个答案: