PHP implements the music on-demand function of WeChat public platform

Implementation ideas of this code: WeChat provides an interface. As long as the data format meets the XML format of the interface it provides, the corresponding music can be sent to followers

1. Construct music messages in XML format provided by WeChat Music XML format:

  FromUserName>
 12345678




 > ;

Write a function to convert the data into this format. The main data is the data in MusicUrl and HQMusicUrl. The former is ordinary quality music, and the latter HQ is high quality, wifi HQ will be played first next time.

private function transmitMusic($object, $musicArray, $flag = 0)
{
 $itemTpl = "
 < ;/Title><li> <description></description>
</li>
<li> <musicurl></musicurl>
</li>
<li> < ;HQMusicUrl></li>
<li> </li>
 $item_str = sprintf($itemTpl, $musicArray['Title'], $musicArray['Description '], $musicArray['MusicUrl'], $musicArray['HQMusicUrl']);
 $textTpl = "
 > ;

 %s

 $item_str
 %d

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

2, construction parameter $musicArray

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

where The $songstr and $singerstr variables must be received from the text of the follower. You first remind the follower to enter the text according to a certain format, and then safely intercept the song artist name according to this fixed format. This is not difficult to achieve This is what I wrote. The $keyword is the content input by the user. The format I require is this: the format is music + song title and singer; for example: the music is about Qi Qin in winter, and the song title and singer are separated by spaces.

$aa = substr($keyword,strpos($keyword,"Music")+strlen("Music"));//Two positions for one Chinese character
$song = substr($aa,0, strpos($aa," "));
$singer = substr($aa,strpos($aa," "));
$songstr = trim((string)$song);
$singerstr = trim((string )$singer);
$musicArray = array("Title"=>$songstr, "Description"=>"Singer:".$singerstr, "MusicUrl"=>$this->getMusicUrl($this- >getMusic($songstr,$singerstr)),"HQMusicUrl"=>$this->getHQMusicUrl($this->getMusic($songstr,$singerstr)));
$resultStr = $this-> transmitMusic($object, $musicArray, $funcFlag);

You can go to w3c to check the specific function usage of string interception. I won’t go into details. The main thing is to obtain the contents of MusicUrl and HQMusicUrl. Baidu Music Interface http://box.zhangmen.baidu.com/x?op = 12&count=1&title=TITLE $$AUTHOR$$$$ Enter http://box.zhangmen.baidu.com/x?op=12&count=1&title=About winter $$Qiqin$$$$ in the browser to observe the content of the XML data provided by the interface, mainly to encode and the data in decode. These two data are connected together. The content in CDATA inside is taken up to the end of xcode, that is, &mid=0.74155984312224. These contents are not required. I have tried it, and this part of the song cannot be played. . The spliced ​​data is the required MusicUrl and HQMusicUrl.

3, the following is the key point, use PHP to parse XML data Since I didn't understand PHP syntax, I spent a lot of time

//Music on demand
function read_child($node)
{
 global $musicstr ;
 $children = $node->childNodes; //Get all child nodes of $node
 foreach($children as $e) //Loop to read each child node
 {
 /*if($e->nodeType == XML_TEXT_NODE) ​​//If the child node is text type, output
 {
 echo $e ->nodeValue."---------"."";
 }*/
 if($e->nodeType == XML_ELEMENT_NODE&&$e->nodeName=='encode ') //If the child node is text type, output
 {
 $musicstr.=$e->nodeValue;
 }
 if($e->nodeType == XML_ELEMENT_NODE&&$e->nodeName=='decode ') //If the child node is text type, output
 {
 $musicstr.=$e->nodeValue."|";
 }
 if($e->nodeType == XML_ELEMENT_NODE) ​​//If the child node is a node object, call the function to process
 {
 $this->read_child($e); //Note that $this-> here is because these methods are all written in the wechatCallbackapiTest class of WeChat, so You have to add to call these functions.
 }
 }
 return $musicstr ;
}
function getMusic($song,$singer)
{
 $dom = new DomDocument(); //Create DOM object
 $dom- >load('http://box.zhangmen.baidu.com/x?op=12&count=1&title='.$song.'$$'.$singer.'$$$$'); //Read XML file
 $root = $dom->documentElement; //Get the root of XML data
 return $this->read_child($root);
 //return $b; //Call the read_child function to read the root object
 }
function getMusicUrl($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"));
}

I made it with DOM, Baidu knows to ask others. Of course, there is a better way to get the MusicUrl in the XML data:

xml = file_get_contents('http://box.zhangmen.baidu.com/x?op=12&count=1&title=About Winter$$Qiqin$$$$');
$result = simplexml_load_string ($xml);
echo strval($result->url->encode);
echo strval($result->url->decode);
//Output: http://zhangmenshiting.baidu. com/data2/music/64380827/Z2ZmbGVuaW9fn6NndK6ap5WXcGVpZpuaZJdrbGtqmm1mY2lolppnmpSXZWZubZyclmlmmZaXa3
CTZJeZmW1ncGVll1qin5t1YWBmbGxsamxlaGVrbG9taTE$
64380827.mp3?xcode=140db3e8864c55164ad0bce2297ede73eaa48b2ded70843d&mid=0.38763446277961

The effect picture is as follows: