PHP 8.2 Deprecated function: utf8_encode()

Thanks for the patch, but I think there's a small error in it:

I think that the parameters 'ISO-8859-1' and 'UTF-8' need to be swapped:

• utf8_encode() converts ISO-8859-1 to UTF-8
• mb_convert_encoding() signature is $string, $to_encoding, $from_encoding. So the desired encoding of the result, in this case 'UTF-8' is the second parameter. The third parameter is the current encoding used to interpret string, in this case ' ISO-8859-1'.

By the way: I see that the tests report much more PHP 8.2 deprecations, but these could be handled in an other issue.

Thanks! Committed #4.