json字符串如下: { "headers": { "Content-Type": ["application\/json;charset=utf-8"], "Content-Length": ["110"], }, "statusCode": 200 } 我通过 $json=json_encode(上面的返回字符串); 我如何取statusCode的值? 我用$json['statusCode']返回500错误: "message": "Cannot access offset of type string on string"