What is the unique identifier that can be obtained in the background when the WeChat official account is developed?

For example, this number has good benefits. if someone else is afraid of receiving more, he or she will log in to N numbers on his or her mobile phone. Can I get some other information to identify, mac, or mobile phone serial number? At present, I have learned phpjs and so on. I haven't actually done it yet. I just want to know this... for example, this number has good benefits. if someone else is afraid of receiving more, he or she will log in to N numbers on his or her mobile phone.
Can I get some other information to identify, mac, or mobile phone serial number?

At present, I have learned php js and other things in a few ways. I have not done any practical work yet.
I hope you can just say a few words in depth. more is better. thank you !!!

Reply content:

For example, this number has good benefits. if someone else is afraid of receiving more, he or she will log in to N numbers on his or her mobile phone.
Can I get some other information to identify, mac, or mobile phone serial number?

At present, I have learned php js and other things in a few ways. I have not done any practical work yet.
I hope you can just say a few words in depth. more is better. thank you !!!

1. Each user has its own unique id.

2. Because of the permission relationship, not every public account can obtain the user id, so users under each public account also haveThe unique id of the user's public accountOpenid

3. Many public accounts are bound to public accounts. In fact, it is obvious that users have a unique id.

4. In web page auth authorization, silent authorization has few permissions. only authorized users can obtain the user's id, profile picture, region, signature, and other information.

Openid can be used to differentiate