[Solved] How to use PDO in codeigniter 3

Working am I able to use mysqli in the dsn area?

The PDO MySQL driver is not the same thing as the PHP MySQL driver, so there is no need to use mysqli (nor does it exist) with PDO.

Thank you for letting me know.

There's only one rule - please don't tell anyone to go and read the manual.  Sometimes the manual just SUCKS!