php - The XML data Eventkey returned by WeChat follow event push is empty

Question

{

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

}

This is the data returned by the follow event triggered by the user following the WeChat service account. Does anyone know why Eventky is empty?
Because that value needs to be used for business logic

The following is the description of the WeChat follow interface

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