🐛 Fix xml UTF8 encoding

[HamzaAlayed]

🐛 Use UTF8 encoding to fix some special characters in xml response and fix this error DOMDocument::loadXML(): PCDATA invalid Char .....

[kkmuffme]

While this is possible, I don't think that's a good idea.

Why not encode it with UTF-8?

if (mb_detect_encoding($xml_string, 'UTF-8', true) === false) {
        $xml_string = utf8_encode($xml_string);
}

[HamzaAlayed]

@hlu2 could you take a look?