dynamic css file for admin / backend and get_option results in Uncaught Error: Call to undefined function get_option()
I try to style the admin area with a dynamic css. I need to configure some elements regarding the frontend user defines. He can choose a color and this color should reflected in some elements in the admin area (e.g. buttons in admin area).
My approach: Setting up a evacolor.css, but let apache interpret this as a php file. This works so fare: