I am looking to override a function in functions.php through a theme or plugin. Specifically, is_ssl(), which does not have any filter or action hooks. Obviously, the easy why would be to update functions.php itself, but this will leave issues with upgrade and compatibility. How could this be done.
Edit: The goal is to overwrite is_ssl() function to return true when specific flag is set in the request header.
Is it possible with the override-function?