How to remove diacritics from text?

Question

I am making a swedish website, and swedish letters are å, ä, and ö.

I need to make a string entered by a user to become url-safe with PHP.

Basically, need to

Answer 1

and all swedish should be converted like this:

'å' to 'a' and 'ä' to 'a' and 'ö' to 'o' (just remove the dots above).

Use normalizer_normalize() to get rid of diacritical marks.

The rest should become underscores as I said.

Use preg_replace() with a pattern of [\W] (i.o.w: any character which doesn't match letters, digits or underscore) to replace them by underscores.

Final result should look like:

$data = preg_replace('[\W]', '_', normalizer_normalize($data));