How to tell if stored in a database is garbled

Developers say that reading from the database is???

The database table character set is UTF8, and set names UTF8, why is it read or???

You can tell??? is stored in the database , how to verify it?

1. Temporarily open General_log to see what the developer is inserting

2. Packet Capture analysis

Character set test case, operating system character set is UTF8

The character set of the table	Set names	Save Chinese	Read Chinese
Latin1	Latin1	No error	Latin1 Read Normal UTF8 garbled
Latin1	Utf8	Error	Empty
Utf8	Latin1	No error	Latin1 Read Normal UTF8 garbled
Utf8	Utf8	No error	Latin1 garbled UTF8 Read normal
Gbk	Latin1	Error	Empty
Gbk	Utf8	No error	UTF8 Read normal Latin1 garbled

How to tell if stored in a database is garbled