Php 解析多维数组中的项

我正在创建一个电子商务网站，在那里我必须给出一个商店在特定数组中的类别。当前，从mysql表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，并为子类别创建嵌套数组。代码在laravel 4.2中。下面是即将发布的数据格式

"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;

            }
        }

---

我不完全确定我看到了什么偏移误差可能发生，但我相信你可以很容易地逃脱

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'];
}

---

无法在$SubcategoriesNameLocal中直接推送数组，因为您正在嵌套数组。在外部创建一个数组，然后将其连接到字段。

尝试以下操作：

// 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;

            }
        }

//对于当前类别，为相同类别的子类别创建公共数组
$filteringSelectedCategories=[]；
$subcategoriesNameLocal=[]；
$innerIndex=0；
对于（$i=0；$i

如果您使用的是mysql，我怀疑一个组会解决这个问题，请展示如何让dataphp让foreach迭代数组项而不是for。下面是我在应用上述解决方案后得到的工作结果，“data”：[{“id”：1，“name”：“Fruits”，“sub_category\u name”：[“Dairy Whiteners”，“茶和咖啡”，“浓缩物-汤等”]，“总计项目”：69}，{“id”：2，“名称”：“饮料”，“子类别名称”：[“茶和咖啡”，“浓缩物-汤等”]，“总计项目”：28}]是的，我的错。已将帖子更新为

foreach

。谢谢你发现了。

// 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;

            }
        }