php如果子数组将该键添加到父键，则将每个数组键转换为strng

Question

我创建了以下代码来循环json数据，并将密钥放在一个数组中，以便稍后引用它们。我做了我需要的但它没有经过优化，应该有一个更好的方法来实现这个功能。 json数据改变了不同类型的时间。在示例中，我使用来自分类源的json数据。

我尝试了两种直接的方法来实现这个功能，我可以重复使用，而不是一直重新输入这些代码。 - 如果值是数组则调用自身的函数 - 传递参考fuinction 但我没能让它发挥作用。

我的问题是，如果有人就此提出建议，我应该学习哪些主题来理解这一点。

{
    "categories": {
        "0": {
            "@attributes": { 
                "category_id": "2" 
            },
            "category_id": "2",
            "parent_id": "1",
            "categories_name": "Dutch name",
            "isActive": 1,
            "categories_image": "",
            "categories_image_alt": "",
            "sort_order": "1",
            "date_added": "01-07-2014",
            "last_modified": "30-01-2017",
            "categories_name_languages": { 
                "dutch": { 
                    "name":  "Dutch name"  
                } 
            },
            "description": { 
                "dutch": { 
                    "above": { 
                        "@cdata": ""  
                    }, 
                    "below": { 
                        "@cdata": ""  
                    }
                } 
            },
            "meta": {
                "dutch": {
                    "url": "dutch-url",
                    "title": "meta dutch title string" 
                } 
            }
        }
    }
}

PHP：

$mapping = array();
foreach ($jsonResult['categories'][0] as $key => $value) {
    if(is_array($value)) {
        foreach ($value as $key2 => $value2) {
            if(is_array($value2)) {
                foreach ($value2 as $key3 => $value3) {
                    if(is_array($value3)) {
                        foreach ($value3 as $key4 => $value4) {
                            if(is_array($value4)) {
                                $mapping[] = $value4;
                            }else {
                                $mapping[] = '[\''. $key . '\'][\'' . $key2 . '\'][\'' . $key3 . '\'][\'' . $key4  . '\']';
                            }
                        }
                    }else {
                        $mapping[] =  '[\''. $key . '\'][\'' . $key2 . '\'][\'' . $key3 . '\']';
                    }
                }
            }else {
                $mapping[] =  '[\''. $key . '\'][\'' . $key2 . '\']';
            }
        }
    } else {
        $mapping[] =  '[\''. $key . '\']';
    }
}

结果是：

(
    [0] => ['@attributes']['category_id']
    [1] => ['category_id']
    [2] => ['parent_id']
    [3] => ['categories_name']
    [4] => ['isActive']
    [5] => ['categories_image']
    [6] => ['categories_image_alt']
    [6] => ['sort_order']
    [8] => ['date_added']
    [9] => ['last_modified']
    [10] => ['categories_name_languages']['dutch']['name']
    [11] => ['description']['dutch']['above']['@cdata']
    [12] => ['description']['dutch']['below']['@cdata']
    [13] => ['meta']['dutch']['url']
    [14] => ['meta']['dutch']['title']
)

然后每次如果我使用基于json的类别，我可以加载此映射并确切知道从多个阵列获取值的位置。

添加了代码@Barmar

function mapArray($arr) {
    $output = [];
    $map = [];

    foreach ($arr as $key => $value) {
        if (is_array($value)) {
            foreach(mapArray($value) as $flattenKey => $flattenValue) {
                $output["${key}][${flattenKey}"] = "['${key}']['${flattenKey}']";
                $map[] = "['${key}']['${flattenKey}']";
            }
        } else {
            $output[$key] = $key;
            $map[] = $key;
        }
    }

    return $output;
}

新输出：

Array
(
    [@attributes][category_id] => ['@attributes']['category_id']
    [category_id] => category_id
    [parent_id] => parent_id
    [categories_name] => categories_name
    [isActive] => isActive
    [categories_image] => categories_image
    [categories_image_alt] => categories_image_alt
    [sort_order] => sort_order
    [date_added] => date_added
    [last_modified] => last_modified
    [categories_name_languages][dutch][name] => ['categories_name_languages']['dutch][name']
    [description][dutch][aboveProducts][@cdata] => ['description']['dutch][aboveProducts][@cdata']
    [description][dutch][belowProducts][@cdata] => ['description']['dutch][belowProducts][@cdata']
    [meta][dutch][categories_seo_url] => ['meta']['dutch][categories_seo_url']
    [meta][dutch][categories_meta_title] => ['meta']['dutch][categories_meta_title']
)

输出$ map：

Array
(
    [0] => ['@attributes']['0']
    [1] => category_id
    [2] => parent_id
    [3] => categories_name
    [4] => isActive
    [5] => categories_image
    [6] => categories_image_alt
    [7] => sort_order
    [8] => date_added
    [9] => last_modified
    [10] => ['categories_name_languages']['0']
    [11] => ['description']['0']
    [12] => ['description']['1']
    [13] => ['meta']['0']
    [14] => ['meta']['1']
)