The PatchworkUtf8 class implements the quasi complete set of string functions that need UTF-8 grapheme clusters awareness. These functions are all static methods of the PatchworkUtf8 class. The best way to use them is to add a use PatchworkUtf8 as u; at the beginning of your files, then when UTF-8 awareness is required, prefix by u:: when calling them.

In the README for the tool he talks about the functions included in the current release that match PHP's string functions as well as some additional methods like "isUtf8", "bestFit" and "strtocasefold". It relies on the mbstring, iconv and intl extensions being installed, and if they aren't, it falls back to other functionality (list of those methods included).

I spent the last weekend (may 09/10) on the PHP Testfest Berlin, organized by Till for the Berlin PHP Usergroup. Coming from Leipzig, I don't really know who of the other 8 people were from the user group and who not.

He mentions issues the group faced (OS X being difficult, PHP from CVS not compiling), the intro to testing and their first area of choice - gettext (which they got up to 98.8% coverage!). The second and third efforts were some work done on the intl and sockets extensions.