Functions-online.com is used more and more around the world. Some user commented already, that UTF-8 support is a must for such a site. I figured out some problems with this and blow them out of the script. 
Finaly the site is now deliverd in UTF-8 and the functions work as well in UTF-8. Yeah!
One problem still exists: PHP 5 is written and working in ISO, so some not binary-safe functions will not work as expected. The binary-safe functions of mb_string will be added in some time to eliminate this problem.
Additionally the design got some bugfixing and is now a little bit more smooth.