However sometimes there is a need to unset default charset as well (for instance if the AddDefaultCharset is set in the apache config and this is causing problems).

This is very easy to do just edit the .htaccess file and add a line that says

AddDefaultCharset OFF

What we had to do is to make the form post the data as ISO-8859-1.
We did this by adding accept-charset=”iso-8859-1″ to the forms that we send to DIBS.

In “/app/design/frontend/default/blank/template/dibs/standard/redirect_paymentwindow.phtml”

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<form action="https://payment.architrade.com/paymentweb/start.action" method="post" name="dibs" id="dibs" accept-charset="iso-8859-1">

Once we had done this then the order details were shown correctly on the DIBS page (yes, the Chinese chars are just a test, I have no idea what it might say)

 iconv --from-code=ISO-8859-1 --to-code=UTF-8 ./oldfile.htm > ./newfile.html

This will create a new file with the converted encoding.

iconv can of of course convert to and from several other charsets. To see a list of all the encodings that iconv can work with use:

 iconv -l

If you wish to massconvert files find can be used with exec

 find . -name "*.txt" -exec iconv -f ISO-8859-1 -t UTF-8 {} -o {}.utf8 \;

AddDefaultCharset UTF-8

If you only wish to do this to php or htm files (and not all files)

<FilesMatch "\.(htm|php)$">
AddDefaultCharset UTF-8
</FilesMatch>

If you wish to modify the mime-type as well as the encoding (on html files in this example)

AddType 'text/html; charset=UTF-8' html