About the problem of reading data encoding

About reading data encoding problems
PHP files and databases are UTF8 format, read the data in the database is actually GB2312 encoding, but the data table fields are UTF8 format, can only be selected within the page encoding gb2312 to be able to display normally.

Where does the question arise, please?

------Solution--------------------

References:

Reference: mysql_query ("Set names UTF8");//query with UTF8 code query

The same is garbled.

Set names UTF8 only works on subsequent data and does not change the data in the database

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