php xml与数组的转换函数

    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;
    }

    //将XML转为array
    function xmlToArray($xml)
    {
        //禁止引用外部xml实体
        libxml_disable_entity_loader(true);
        $values = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $values;
    }

  $obj2="<xml>
  <wxappid><![CDATA[wx1b7559b818e3c123]]></wxappid>
  <mch_id>1235571234</mch_id>
  <mch_billno>1235571234201605241726128109</mch_billno>
  <client_ip><![CDATA[127.0.0.1]]></client_ip>
  <re_openid><![CDATA[oiPuduGV7gJ_MOSfAWpVmhhgXh-U]]></re_openid>
  <total_amount>101</total_amount>
  <min_value>101</min_value>
  <max_value>101</max_value>
  <total_num>1</total_num>
  <nick_name><![CDATA[方倍工作室]]></nick_name>
  <send_name><![CDATA[方倍工作室]]></send_name>
  <wishing><![CDATA[恭喜发财]]></wishing>
  <act_name><![CDATA[方倍工作室送红包]]></act_name>
  <remark><![CDATA[关注公众账号]]></remark>
</xml>";

打印结果

Array
(
    [wxappid] => wx1b7559b818e3c123
    [mch_id] => 1235571234
    [mch_billno] => 1235571234201605241726128109
    [client_ip] => 127.0.0.1
    [re_openid] => oiPuduGV7gJ_MOSfAWpVmhhgXh-U
    [total_amount] => 101
    [min_value] => 101
    [max_value] => 101
    [total_num] => 1
    [nick_name] => 方倍工作室
    [send_name] => 方倍工作室
    [wishing] => 恭喜发财
    [act_name] => 方倍工作室送红包
    [remark] => 关注公众账号
)