JSON字符串：
```
{
  "type": 4,
  "charge": false,
  "dispatch": [],
  "dynamic": [],
  "longterm": {
    "id": "503",
    "rule_id": "108",
    "start_time": "0",
    "end_time": "3600",
    "type": "3",
    "free_km_1": "48.00",
    "price_1": "49.00",
    "free_km_2": "50.00",
    "km_2": "51.00",
    "price_2": "52.00",
    "max_price_2": "53.00",
    "km_3": "3.00",
    "price_3": "15.00",
    "max_price_3": "100.00",
    "km_4": "57.00",
    "price_4": "58.00",
    "ratio_4": "59.00",
    "max_price_4": "60.00"
  }
}
```
PHP脚本：
```php
class JsonToTree {
    // 解析
    public static function analysis($json) {
        $arr = json_decode($json, true);
        // 结果集
        $list = [];
        foreach ($arr as $k=>$v){
            if (!is_array($v) || (is_array($v) && empty($v))) {
                $list[] = $k;
            } else {
                // 递归组装
                $treeArray = self::tree($k, $v);
                $list = array_merge($list, $treeArray);
            }
        }

return $list;
    }

// 递归组装
    private static function tree($title, $arr, $list = []) {
        foreach ($arr as $k => $v) {
            // 最后一个节点
            if (!is_array($v) || (is_array($v) && empty($v))) {
                $list[] = $title.'['.$k.']';
            } else {
                // 递归组装
                return self::tree($title.'['.$k.']', $v, $list);
            }
        }

return $list;
    }
}

echo '<pre>';
$json = '';
var_dump(JsonToTree::analysis($json));
```

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