PHP实现微信公众平台音乐点播

<xml> 
  <ToUserName><![CDATA[toUser]]></ToUserName> 
  <FromUserName><![CDATA[fromUser]]></FromUserName> 
  <CreateTime>12345678</CreateTime> 
  <MsgType><![CDATA[music]]></MsgType> 
  <Music> 
    <Title><![CDATA[TITLE]]></Title> 
    <Description><![CDATA[DESCRIPTION]]></Description> 
    <MusicUrl><![CDATA[MUSIC_Url]]></MusicUrl> 
    <HQMusicUrl><![CDATA[HQ_MUSIC_Url]]></HQMusicUrl> 
    <ThumbMediaId><![CDATA[media_id]]></ThumbMediaId> 
  </Music> 
</xml>

private function transmitMusic($object, $musicArray, $flag = 0)
    {
  $itemTpl = "<Music>
        <Title><![CDATA[%s]]></Title>
      <Description><![CDATA[%s]]></Description>
      <MusicUrl><![CDATA[%s]]></MusicUrl>
      <HQMusicUrl><![CDATA[%s]]></HQMusicUrl>
    </Music>";

  $item_str = sprintf($itemTpl, $musicArray['Title'], $musicArray['Description'], $musicArray['MusicUrl'], $musicArray['HQMusicUrl']);

  $textTpl = "<xml>
      <ToUserName><![CDATA[%s]]></ToUserName>
      <FromUserName><![CDATA[%s]]></FromUserName>
      <CreateTime>%s</CreateTime>
      <MsgType><![CDATA[music]]></MsgType>
      $item_str
      <FuncFlag>%d</FuncFlag>
      </xml>";

  $resultStr = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time(), $flag);
  return $resultStr;
    }

$musicArray = array("Title"=>$songstr, "Description"=>"歌手:".$singerstr, "MusicUrl"=>$this->getMusicUrl($this->getMusic($songstr,$singerstr)),"HQMusicUrl"=>$this->getHQMusicUrl($this->getMusic($songstr,$singerstr)));

$aa = substr($keyword,strpos($keyword,"音乐")+strlen("音乐"));//一个汉字2个位置
       $song = substr($aa,0,strpos($aa," "));
       $singer = substr($aa,strpos($aa," "));
             $songstr = trim((string)$song);
             $singerstr = trim((string)$singer);
             $musicArray = array("Title"=>$songstr, "Description"=>"歌手:".$singerstr, "MusicUrl"=>$this->getMusicUrl($this->getMusic($songstr,$singerstr)),"HQMusicUrl"=>$this->getHQMusicUrl($this->getMusic($songstr,$singerstr)));
             $resultStr = $this->transmitMusic($object, $musicArray, $funcFlag);

//音乐点播
function read_child($node)
{
  global $musicstr ;
  $children = $node->childNodes; //获得$node的所有子节点
  foreach($children as $e) //循环读取每一个子节点
  {
      /*if($e->nodeType == XML_TEXT_NODE) //如果子节点为文本型则输出
      {
          echo $e->nodeValue."---------"."<BR>";
      }*/
      if($e->nodeType == XML_ELEMENT_NODE&&$e->nodeName=='encode') //如果子节点为文本型则输出
      {
          $musicstr.=$e->nodeValue;
      }
      if($e->nodeType == XML_ELEMENT_NODE&&$e->nodeName=='decode') //如果子节点为文本型则输出
      {
          $musicstr.=$e->nodeValue."|";
      }
      if($e->nodeType == XML_ELEMENT_NODE) //如果子节点为节点对象，则调用函数处理
      {
        $this->read_child($e); //注意这里的$this->是因为的这些方法都是写在微信的那个wechatCallbackapiTest类中的，所以得加才能调用到这些函数。
      }
  }
  return  $musicstr ;
}

function getMusic($song,$singer)
{
  $dom = new DomDocument(); //创建 DOM对象
  $dom->load('http://box.zhangmen.baidu.com/x?op=12&count=1&title='.$song.'$$'.$singer.'$$$$'); //读取 XML文件
  $root = $dom->documentElement; //获取 XML数据的根
  return $this->read_child($root);
  //return $b; //调用 read_child函数读取根对象
}

function getMusicUrl($url)
{
  // echo strpos($url,"&")."musciURL";
    return substr($url,0,strpos($url,"&"));
}
function getHQMusicUrl($url)
{
    //echo  strripos($url,"&")."HQmusicURL";
    return substr($url,strripos($url,"http"),strripos($url,"&")-strripos($url,"http"));
}

xml = file_get_contents('http://box.zhangmen.baidu.com/x?op=12&count=1&title=大约在冬季$$齐秦$$$$');
$result = simplexml_load_string($xml);
echo strval($result->url->encode);
echo strval($result->url->decode);
//输出:http://zhangmenshiting.baidu.com/data2/music/64380827/Z2ZmbGVuaW9fn6NndK6ap5WXcGVpZpuaZJdrbGtqmm1mY2lolppnmpSXZWZubZyclmlmmZaXa3CTZJeZmW1ncGVll1qin5t1YWBmbGxsamxlaGVrbG9taTE$
64380827.mp3?xcode=140db3e8864c55164ad0bce2297ede73eaa48b2ded70843d&mid=0.38763446277961