简单输出JSON字符串

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;

回复讨论(解决方案)

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

和对象有关的一些信息，包括对象Id等一些

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

具体含义只用你知道

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