How to load ICU for SQLite in PHP?

I’m having horrible trouble enabling ICU for sqlite for a while now…
I just can’t figure out how to do it, after Googling for ages now, I’m still where I started, so could someone shed some light and explain to me how to do it?

I work mainly with the PDO version of SQL in PHP, for testing I use xampp on windows.

I’m a total beginner when it comes to installing extension and If I could only get it to work on at least my testing environment I would be eternally grateful.