in reply to Re^5: How to avoid decoding string to utf-8.in thread How to avoid decoding string to utf-8.
Charset seem to set up to utf-8,
META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=utf-8
That is the charset of the web page, not the charset that the browser sends you when it submits form data.
Usually, setting the charset of the web page should ensure UTF-8, but it seems that this depends on the browser. I still recommend looking at the headers of the incoming request.