Can there be in whatever way to make use of custom Wordpress installed authentication with Codeigniter framework?

It might try taking some custom work to obtain the Wordpress auth library, place it into CI, after which obtain the look-and-feel suitable for your application.

An easy method is always to make use of an auth library which has been specifically produced for CI, such as the wonderful TankAuth...

There's an order known as is drenched in or something like that when i keep in mind that I made use of inside a php script. If you log into wordpress, and employ it within the CI auth it could work this way.