请教以下XML字符串要怎么解析得到code和result呢

请问以下XML字符串要如何解析得到code和result呢？
不是为空就是报错：

PHP code

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$xml = '<?xml version="1.0" encoding="utf-8"?>
<apiresult xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/">
  <code>0</code>
  <result>短信提交成功</result>
</apiresult>';

$xml = iconv('gbk', 'utf-8', $xml);//转了也不行

$dom = simplexml_load_string($xml);

$result_code = iconv('utf-8', 'gbk', $dom->code);//结果代码
$result_info = iconv('utf-8', 'gbk', $dom->result);//结果信息

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