解析未知深度的嵌套数组

Question

我从第三方获取 json 文件，其中键值对的深度可变，类似于： *** 编辑 JSON 以阐明将在 mysql db 中使用的表名。键是表中的列，值是数据。从 json 到 json 的列名将是静态的。

   {                         
   "Key1": "Value1",  //non-nested key:value go to default table                     
   "Key2": "Value2",                      
   "Key3": "Value3",                                 
   "Table1": [],                      
   "Table2": [{                      
        "Key1": "Value1",                  
        "Key2": "Value2",                  
        "Key3": "Value3"},

        {"Key1": "Value1",                  
         "Key2": "Value2",                  
         "Key3": "Value3"}],

    "Table3": [
          {"Key1": "Value1",                  
            "Key2": "Value2",                  
            "Key3": "Value3"},
             {"Table4": [
                   {"Key1": "Value1",              
                    "Key2": "Value2",              
                    "Key3": "Value3"},
                {"Table5": [
                           {"Key1": "Value1",          
                            "Key2": "Value2",          
                            "Key3": "Value3"}]
                 }]
           }]    
     }

** 此示例通过 JSON 验证

对于初始键：值对（不在嵌套数组中），我需要设置一个表名，将所有非嵌套值插入表中。对于嵌套的 Key:Value 对，需要将表名设置为 Array 键，即 Array1、Array2、Array3 等，其中嵌套的 Key 为列名，Value 为数据。

我一直在尝试使用 RecursiveIteratorIterator 重申数组（我知道这比数组的嵌套 foreach 处理有一些速度优势）但无论哪种方式..我在分离嵌套数组和拉出底层数组时遇到了麻烦键：值。

我正在尝试这个：

$iterator = new RecursiveIteratorIterator(
    new RecursiveArrayIterator($data1),
    RecursiveIteratorIterator::SELF_FIRST
);
foreach ($iterator as $key=>$value){
        if (!is_array($value)){
        //echo $key." KEY is not an array <br>";
        }

        if(is_array($value)){
            //echo $key." KEY is an array <br>";
                foreach($value as $key1=>$val1){
                    if (is_array($val1)){
                    //echo $key1."KEY 1 is an array<br>";  
                }
            }    
        }
    }    

---

更新

用户@olibiaz 提出了一个几乎 100% 正确的解决方案：

function toto(array $input, $tableName = '')
{
    foreach ($input as $key => $element) {
      if (is_array($element)) {
         toto($element, $key);
      } else {
          if ($tableName === '') {
             // here is the non nested elelement,
             // you can choose the tableName you want
             $tableName = 'NonNestedTableName';
          }
          // place your insert here or whatever you want
          // here, the tablename is the index of the nested array
          echo "TableName: $tableName, Key: $key, Data: $element \n";
      }
    }
}

这是在我的 JSON 数据上运行上述代码时得到的输出：

TableName: project, Key: Key1, Data: Value1 // "project" used for non-nested
TableName: project, Key: Key2, Data: Value2 
TableName: project, Key: Key3, Data: Value3
TableName: 0, Key: Key1, Data: Value1  // Tablename needs to be "Array2"
TableName: 0, Key: Key2, Data: Value2  // for these 3 data sets
TableName: 0, Key: Key3, Data: Value3 
TableName: 1, Key: Key1, Data: Value1  // Tablename needs to be "Array2"
TableName: 1, Key: Key2, Data: Value2 
TableName: 1, Key: Key3, Data: Value3 
TableName: 0, Key: Key1, Data: Value1  // Tablename needs to be "Array3"
TableName: 0, Key: Key2, Data: Value2 
TableName: 0, Key: Key3, Data: Value3  
TableName: 0, Key: Key1, Data: Value1  // Tablename needs to be "Array4"
TableName: 0, Key: Key2, Data: Value2 
TableName: 0, Key: Key3, Data: Value3 
TableName: 0, Key: Key1, Data: Value1  // Tablename needs to be "Array5"
TableName: 0, Key: Key2, Data: Value2 
TableName: 0, Key: Key3, Data: Value3

但是，我需要使用数组的键名，而不是使用数字索引作为表名。也许 olibiaz 或其他用户对如何实现这一点有建议？

Answer 1

在所有 cmets 和交流之后编辑。我会更准确地举你的例子

<?php

$inputJson = '{                         
   "Key1": "Value1",                      
   "Key2": "Value2",                      
   "Key3": "Value3",                                 
   "Table1": [],                      
   "Table2": [{                      
      "Key1": "Value1",                  
      "Key2": "Value2",                  
      "Key3": "Value3"},
     {
        "Key1": "Value1",                  
        "Key2": "Value2",                  
        "Key3": "Value3"}],
   "Table3": [{
        "Key1": "Value1",                  
        "Key2": "Value2",                  
        "Key3": "Value3"},
         {
           "Table4": [{
              "Key1": "Value1",              
              "Key2": "Value2",              
              "Key3": "Value3"},
           {
              "Table5": [{
                 "Key1": "Value1",          
                 "Key2": "Value2",          
                 "Key3": "Value3"}]
             }]
       }]    
 }';

所以输入和你一样，那么这里就是递归函数

function toto(array $input, $tableName = '')
{
    foreach ($input as $key => $element) {
        if (is_array($element)) {
            // if key is integer its the first level of array so we keep the $tablename - edited part
            $key = is_int($key) ? $tableName : $key;
            toto($element, $key);
        } else {
            if ($tableName === '') {
                $tableName = 'NonNestedTableName';
            }
            echo "TableName: $tableName, Key: $key, Data: $element \n";
        }
    }
}

$inputArray = json_decode($inputJson, true);

toto($inputArray);

这将显示

表名：NonNestedTableName，键：Key1，数据：Value1

表名：NonNestedTableName，键：Key2，数据：Value2

表名：NonNestedTableName，键：Key3，数据：Value3

表名：Table2，键：Key1，数据：Value1

表名：Table2，键：Key2，数据：Value2

表名：Table2，键：Key3，数据：Value3

表名：Table2，键：Key1，数据：Value1

表名：Table2，键：Key2，数据：Value2

表名：Table2，键：Key3，数据：Value3

表名：Table3，键：Key1，数据：Value1

表名：Table3，键：Key2，数据：Value2

表名：Table3，键：Key3，数据：Value3

表名：Table4，键：Key1，数据：Value1

表名：Table4，键：Key2，数据：Value2

表名：Table4，键：Key3，数据：Value3

表名：Table5，键：Key1，数据：Value1

表名：Table5，键：Key2，数据：Value2

表名：Table5，键：Key3，数据：Value3

Answer 2

也许您可以尝试json_decode 将 JSON 字符串转换为数组。它也处理嵌套级别。

试试看：http://php.net/manual/en/function.json-decode.php