php - 微信关注事件推送返回来的XML数据Eventkey为空

Question

{

"ToUserName": "gh_e94f212035ed",
"FromUserName": "oYXWAuBbfE85hoaJv_zLkm0CvtkU",
"CreateTime": "1494585669",
"MsgType": "event",
"Event": "subscribe",
"EventKey": ""

}

这是用户关注微信服务号触发关注事件返回来的数据，有大神知道为什么Eventky会空掉吗？
因为需要用到那个值来做业务逻辑

下面是微信关注接口的说明

Answer 1

The key you are talking about is a QR code generated by the advanced interface. Without the key, it is an ordinary official account QR code. After scanning both codes, you will be redirected to the official account, https://mp.weixin.qq.com/wiki...

Answer 2

The correct answer upstairs is that both the permanent QR code and the temporary QR code generated through the advanced interface are numbered. This event_key is the number of the QR code. Users follow or unfollow by scanning the QR code, which is pushed by WeChat. I will bring this event_key