CMailHeader::ConvertHeader

static function ConvertHeader($encoding, $type, $str, $charset)
{
	if(mb_strtoupper($type) == "B")
		$str = base64_decode($str);
	else
		$str = quoted_printable_decode(str_replace("_", " ", $str));

	$str = Emoji::encode($str);
	$str = CMailUtil::ConvertCharset($str, $encoding, $charset);

	return $str;
}