Slugify in Code Igniter

I'm afraid there are several reason that I think it won't be implemented. Here's a few.
1. You are removing non letters and digits twice.
~[^\pL\d]+~u and [^-\w]+
- This one will remove also "Help"-button, so it becomes Helpbutton, that's not what I wanted. But help-button
2. Setlocale will affect the rest of the code too. And other people on the same process.
http://php.net/manual/en/function.setlocale.php
3. Forcing a convert with US standard. Every server should have that charset installed. But no grantee.
4. Forcing a value upon a user.
5. No options, you can't change the separator or leave it out.

You can use this one if you want. It uses PHP internal Transliterator Class.
https://github.com/ausi/slug-generator
http://php.net/manual/pl/class.transliterator.php