Thinkphp Configuration Method using Utf8mb4

Recently in doing a emoji expression related to the thing, emoji need 4 bytes to store, so need to use to UTF8MB4, but now I find how can not insert this emoji characters. After saving to the database, it will change to????
May I ask who has the relevant experience, tell me how to deal with. Endless thanks.

Solving method

The database, table, and field codes are all set to UTF8MB4

The data connection is configured to

' Db_charset ' => ' utf8mb4 ',

The field character set also needs to be modified to UF8MB4

To properly store