PHP
To use multibyte support you can use the Multi-Byte_string functions. These are available as an extended module and have to be enabled with the configure script.The iconv library functions convert strings between various character sets encodings. The supported character sets depend on the iconv() implementation on your system.
The gettext functions implement an NLS (Native Language Support) API which can be used to internationalize your PHP applications.
When you submit forms, they are will be hard-encoded, so the encoding that will be used to submit your forms will be the encoding that is used for your webpage. If people use an other encoding, your browser will still (mis)treat it as the encoding of your webpage.
You can always use htmlrecode to convert your files. Using the command line.
Zilling Chinese encoding conversion tool.
PHP.net
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