thinkphp sets DB_CHARSET to utf8mb4

tp3.2.3 database configuration 'DB_CHARSET'=> 'utf8mb4', execution error. As follows

SQLSTATE[HY000] [2019] Can't initialize character set utf8mb4 (path: /usr/share/mysql/charsets/)
错误位置

FILE: /data1/www/htdocs/733/ecampus/3/ThinkPHP/Library/Think/Db/Driver.class.php 　LINE: 109

If you don’t use tp, you can use the native sql ‘set names utf8mb4’ and there will be no problem.
What went wrong? Please fix it! Thank you!

Reply content:

tp3.2.3 database configuration 'DB_CHARSET'=> 'utf8mb4', execution error. As follows

SQLSTATE[HY000] [2019] Can't initialize character set utf8mb4 (path: /usr/share/mysql/charsets/)
错误位置

FILE: /data1/www/htdocs/733/ecampus/3/ThinkPHP/Library/Think/Db/Driver.class.php 　LINE: 109

If you don’t use tp, you can use the native sql ‘set names utf8mb4’ and there will be no problem.
What went wrong? Please fix it! Thank you!