数组参数与xml数据包互转

/*数组参数xml数据包*/
public function ArrToXml($arr){
    $xml ="<xml>";
   foreach ($arr as $key => $val) {
     if (is_numeric($val)) {
      $xml .= "<".$key.">".$val."";
     }else{
      $xml .= "<".$key."><![CDATA[".$val."]]>";
     }
   }
   $xml .= "</xml>";
   return $xml;  
}

/*xml转为数组*/
public function XmlToArr($xml){              
       $array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);      
       return $array_data;
}