微信公眾號開發之語音消息識別

1.開通語音識別（默認關閉）

2.語音識別

請注意，開通語音識別后，用戶每次發送語音給公眾號時，微信會在推送的語音消息XML數據包中，增加一個Recognition字段（注：由於客戶端緩存，開發者開啟或者關閉語音識別功能，對新關注者立刻生效，對已關注用戶需要24小時生效。開發者可以重新關注此帳號進行測試）。開啟語音識別后的語音XML數據包如下：

 

<?php
/**
  * wechat php test
  */

//define your token
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
//$wechatObj->valid();//接口驗證
$wechatObj->responseMsg();//調用回復消息方法
class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];

        //valid signature , option
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

    public function responseMsg()
    {
        //get post data, May be due to the different environments
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

          //extract post data
        if (!empty($postStr)){
                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
                   the best way is to check the validity of xml by yourself */
                libxml_disable_entity_loader(true);
                  $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
                $msgType = $postObj->MsgType;//消息類型
                $event = $postObj->Event;//時間類型，subscribe（訂閱）、unsubscribe（取消訂閱）
                
                $textTpl = "<xml>
                            <ToUserName><![CDATA[%s]]></ToUserName>
                            <FromUserName><![CDATA[%s]]></FromUserName>
                            <CreateTime>%s</CreateTime>
                            <MsgType><![CDATA[%s]]></MsgType>
                            <Content><![CDATA[%s]]></Content>
                            <FuncFlag>0</FuncFlag>
                            </xml>"; 
                           
                switch($msgType){
                    case "event":
                    if($event=="subscribe"){
                        $contentStr = "Hi,歡迎關注海仙日用百貨!"."\n"."回復數字'1',了解店鋪地址."."\n"."回復數字'2',了解商品種類.";
                    } 
                    break;
                    case "text"://文本消息
                        switch($keyword){
                            case "1":
                            $contentStr = "店鋪地址："."\n"."杭州市江干區.";    
                            break;
                            case "2":
                            $contentStr = "商品種類:"."\n"."杯子、碗、棉簽、水桶、垃圾桶、洗碗巾(刷)、拖把、掃把、"
                                         ."衣架、粘鈎、牙簽、垃圾袋、保鮮袋(膜)、剪刀、水果刀、飯盒等.";
                            break;
                            default:
                            $contentStr = "對不起,你的內容我會稍后回復";
                        }
                    break;
                    case "voice"://語音消息
                    //語音識別
                    $recognition = $postObj->Recognition;
                    $format = $postObj->Format;
                    $contentStr = "你發送的是語音消息"."\n"."語音格式為:"."\n".$format."\n"."語音內容為:"."\n".$recognition;
                    break;
                }
                $msgType = "text";
                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;
        }else {
            echo "";
            exit;
        }
    }
        
    private function checkSignature()
    {
        // you must define TOKEN by yourself
        if (!defined("TOKEN")) {
            throw new Exception('TOKEN is not defined!');
        }
        
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];
                
        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        // use SORT_STRING rule
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );
        
        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }
}


?>