On the ProDevTips site, Henrik has pointed out a handy application that can make HTML encoding characters outside the norm in PHP simple.
The standard htmlentities() function will encode special characters so that they display OK in the browser. However, sometimes you might want to encode different languages to entities too. I just found a script that will do that in the form of an html encode application.
He includes an example showing how to encode a string of non-english characters out to an easy-to-display HTMLified string.