how to support UTF8 (japanese, arabic, spanish, …) URL's in PHP

[max.]

For a web application, we need to link to some user generated content.A users types in a title for e.g. a product and we generate an SEO friendly url for that product:like this\[code\]title: a nice productwww.user.com/product/a-nice-producttitle: ???? ???www.user.com/product/???? ???\[/code\]The problem is that those foreign language url's aren't supported and a browser refuses to open those links. I've seen wordpress setups support that kind of url's so I guess it's possible to do this.Does anyone know how we should support this in php?wikipedia handles this just fine: http://ar.wikipedia.org