WebReference.com: Create a Localized Web Page with PHP
On WebReference.com there's a new tutorial posted about localizing your website by defining a character set to use for your content.
The process of making your applications/websites usable in many different locales is called internationalization, While customizing your code for different locales is called localization. Localization is the process of making your applications or websites local to where it is being viewed. For example, you can make a website more local to a particular place by converting its text to the predominate language of that location and by displaying the local time (e.g. German for people living in Germany or French for people living in France).
They show how to define constants that can be used in your application for the character set and language encoding. They use two major encodings - UTF-8 and ISO-8859-1 - in their examples of showing a sample "welcome" message in different languages. There's also a simple page to show you how to switch between languages if you'd like to give your visitors the option.