Why is my username in Chinese when I registered, but when I checked it in the background, it changed to "???". I want to know the reason.

Question

Why was my username in Chinese when I registered, but when I checked it in the background, it changed to "???" I want to know the reason

Answer 1

Character set related

Answer 2

The database character encoding is set to utf8

Answer 3

Add an encoding UTF-8 to the HTML page, and also add UTF-8 encoding to the registration page