做一个微信语音点播系统

<?php

    define("TOKEN", "yourtoken");
    $wechatObj = new wechatCallbackapiTest();
   // $wechatObj->valid();
    $wechatObj->responseMsg();
    class wechatCallbackapiTest
    {
        public function valid()
        {
            $echoStr = $_GET["echostr"];
            //valid signature , option
            if($this->checkSignature()){
                echo $echoStr;
                exit;
            }
        }

        public function responseMsg()
        {
            //获取post数据
            $postStr =    $GLOBALS["HTTP_RAW_POST_DATA"];
            //解析post数据
            if (!empty($postStr)){

                $postObj = simplexml_load_string($postStr, ‘SimpleXMLElement‘, LIBXML_NOCDATA);
                $type= $postObj->MsgType;
                switch($type)
                {

                    case "voice";
                        $resultStr=  $this->getMusicContent($postObj);   
                        echo   $resultStr;
                        exit;  
                        break;
                }
            }
     
        }

        private function checkSignature()
        {
            $signature = $_GET["signature"];
            $timestamp = $_GET["timestamp"];
            $nonce = $_GET["nonce"];    

            $token = TOKEN;
            $tmpArr = array($token, $timestamp, $nonce);
            sort($tmpArr);
            $tmpStr = implode( $tmpArr );
            $tmpStr = sha1( $tmpStr );

            if( $tmpStr == $signature ){
                return true;
            }else{
                return false;
            }
        }
        
       public  function getMusicContent($postObj)
        {        
            $ret=   "<xml>
            <ToUserName><![CDATA[%s]]></ToUserName>
            <FromUserName><![CDATA[%s]]></FromUserName>
            <CreateTime>%s</CreateTime>
            <MsgType><![CDATA[music]]></MsgType>
            <Music>
            <Title><![CDATA[%s]]></Title>
            <Description><![CDATA[]]></Description>
            <MusicUrl><![CDATA[%s]]></MusicUrl>
            <HQMusicUrl><![CDATA[%s]]></HQMusicUrl>
            <FuncFlag><![CDATA[1]]></FuncFlag>
            </Music>    
            </xml>";
            $recognition=$postObj->Recognition;  
            $keywordc= urlencode($recognition); 
            $musicapi =  "http://box.zhangmen.baidu.com/x?op=12&count=1&title={$keywordc}\$\$";  
            $simstr=file_get_contents($musicapi);
            $musicobj=simplexml_load_string($simstr);
            $i=0;
            $musicurl;
            foreach($musicobj->url as $itemobj)
            {
                $encode = $itemobj->encode;
                //处理decode ,发现微信在处理音乐的时候有个问题，所以这里删除一个参数
                $decode = $itemobj->decode;   
                $removedecode = end(explode(‘&‘, $decode));
                if($removedecode<>"")
                {
                    $removedecode="&".$removedecode;    
                }
                $decode = str_replace($removedecode,"", $decode);
                $musicurl= str_replace(end(explode(‘/‘, $encode))   ,$decode,$encode);
                break;
            }

            $resultStr = sprintf($ret, $postObj->FromUserName, $postObj->ToUserName,time(), $recognition,$musicurl,$musicurl);
            return $resultStr;

        }     
     
   

    }

?>