JSON转数组 获取有关问题

$cityArry = '[

        {

            "省": "台湾",

            "市": [

                {

                    "市名": "台北县",

                    "编码": "101340101"

                },

                {

                    "市名": "台中",

                    "编码": "101340401"

                }

            ]

        }

    ]';  





$temp1 = json_decode($cityArry);  



$arr = array ($temp1);



print_r($arr[0]);



?>

$arr = json_decode($cityArry, true);  

foreach($arr[0] as $key=>$item) {

  echo $item['省'], PHP_EOL;

  foreach($item['市'] as $row) {

    echo "$row[编码] => $row[市名]\n";

  }

}