I'm using a form to send a subject and a message. I then remove all spaces from the subject using $subject = str_replace(" ", "_", $subject);
I then create a file using $file = fopen($subject, wb) The filename doesn't support the characters Å Ä and Ö. Instead they become ä ä and ö
When i echo $subject; it comes out normal.
I would prefer not having to replace them since I'm making a website for Swedish speaking people.
Make sure your PHP file is properly encoded. I reckon it should be UTF8 but not sure for Swedish.