Similar to the PHP Chinese website, start--prompt to scan QR code to log in--user scans QR code--pops up to follow the public account---follow--login successful.

After success, the server will generate UserID and OpenID binding. The next time the user scans the QR code to log in, he or she will log in directly. And the WeChat public can query his UserID and other information.

How to implement this? Is there any similar tutorial? Thank you!​