简单输出JSON字符串

[woshimaikou]

本人不懂PHP想请问下，下面这段代码输出的json字符串是社么？

class pic_data
{
	 public $data;
	 public $status;
	 public $statusText;
	public function __construct()
	{
		$this->data->urls = array();
	}
}

$d = new pic_data();
$d->data->photoId = 'photoId123';
$d->data->urls[0] = 'url123';
$d->status = 1;
$d->statusText = '上传成功!';
$msg = json_encode($d);
echo $msg;

[小在在]

{"data":{"urls":["url123"],"photoId":"photoId123"},"status":1,"statusText":"\u4e0a\u4f20\u6210\u529f!"}

[洛豪]

和对象有关的一些信息，包括对象Id等一些

[xuzuning]

{"data":{"urls":["url123"],"photoId":"photoId123"},"status":1,"statusText":"\u4e0a\u4f20\u6210\u529f!"} 具体含义只用你知道

[yzimhao]

json格式,json解析,json格式在线校验工具 www.kjson.com