xml,array的转换

//xml转为array
public function xmlToArray($xml)
{
    $xml=simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
    $array_data = json_decode(json_encode($xml), true);
    return $array_data;
}

//array转xml
public function arrayToXml($arr)
{
    $xml = "<xml>";
    foreach ($arr as $key=>$val)
    {
        if (is_numeric($val))
        {
            $xml.="<".$key.">".$val."</".$key.">";
        }
        else
            $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
    }
    $xml.="</xml>";
    return $xml;
}