Server sent charset unknown to the client. Please, report to the developers
[questions]
Connect the lower version of PHP to the higher version of MySQL (such as mysql8.0)
Server sent charset unknown to the client. Please, report to the developers
[solution]
Method (1): upgrade the PHP connection driver
Method (2): put mysql8.0 Change the parameter of character_set_server to utf8 (it cannot be changed online. You need to modify my.cnf and restart Mysql to take effect)