使用PHP解码多个xml标签

我正在寻找一种解码字符串中多个XML标签的"智能方法",我有以下功能:

function b($params) {
    $xmldata = '' . html_entity_decode($params['data']) . '';
    $lang = ucfirst(strtolower($params['lang']));
    if (simplexml_load_string($xmldata) === FALSE) {
        return $params['data'];
    } else {
        $langxmlobj = new SimpleXMLElement($xmldata);

        if ($langxmlobj -> $lang) {
            return $langxmlobj -> $lang;
        } else {
            return $params['data'];
        }
    }
}

并尝试

$params['data'] = 'Service DNSDNS Service - DNS GratuitFree DNS';
$params['lang'] = 'French';
$a = b($params);
print_r($a);

但是产出:

Service DNS

我希望它基本上输出每个标签,因此结果应该是:

Service DNS - DNS Gratuit

拉出我的头发.任何快速帮助或指示将不胜感激.

编辑:优化需求.

似乎我不够清楚; 让我举一个例子

如果我有以下字符串作为输入:

The ChatCat is very happy to stay on stackoverflow 
because it makes him HeureuxHappy to know that it 
is the best EndroitPlace to find good people with
good RéponsesAnswers.

因此,如果我使用'French'运行函数,它将返回:

The Chat is very happy to stay on stackoverflow 
because it makes him Heureux to know that it 
is the best Endroit to find good people with
good Réponses.

用'英语':

The Cat is very happy to stay on stackoverflow 
because it makes him Happy to know that it 
is the best Place to find good people with
good Answers.

希望现在更清楚了.