微信公众号最佳实践（ 4.3）语音识别

dq_095

4210人浏览 · 2018-08-27 23:32:00

dq_095 · 2018-08-27 23:32:00 发布

4.3.1 接取识别结果

开通语音识别功能以后，用户每次发送语音给微信公众号，微信会在推送语音消息XML数据包中添加一个Recongnition字段，该字段为语音识别出的文本内容.

注：由于客户端缓存，开发者开启或者关闭语音识别功能，对新关注者立刻生效，对已关注用户需要24小时生效。开发者可以重新关注此帐号进行测试

<xml>
    <ToUserName>
        < ![CDATA[toUser] ]>
    </ToUserName>
    <FromUserName>
        < ![CDATA[fromUser] ]>
    </FromUserName>
    <CreateTime>1357290913</CreateTime>
    <MsgType>
        < ![CDATA[voice] ]>
    </MsgType>
    <MediaId>
        < ![CDATA[media_id] ]>
    </MediaId>
    <Format>
        < ![CDATA[Format] ]>
    </Format>
    <Recognition>
        < ![CDATA[腾讯微信团队] ]>
    </Recognition>
    <MsgId>1234567890123456</MsgId>
</xml>

这里写图片描述

使用语音识别接口可以简化输入，从繁琐的键盘输入中解放出来，对于一些简单内容的输入，用户可以直接使用语音与微信公众号进行交互

4.3.2 处理识别消息

微信公众号接收到语音后，由于数据包中已经包含了识别结果的文字内容，所有原则上，应当将其当作文本消息一样处理

public function responseMsg()
    {
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        if (!empty($postStr)){
            $this->logger("R ".$postStr);
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $RX_TYPE = trim($postObj->MsgType);

            switch ($RX_TYPE)
            {
                case "voice":
                case "text":
                    $result = $this->receiveText($postObj);
                    break;
            }
            $this->logger("T ".$result);
            echo $result;
        }else {
            echo "";
            exit;
        }
    }

在接收函数中，再将语音消息的识别结果或文本消息的文本赋给同一个变量

代码如下：

//接收文本、语音消息
    private function receiveText($object)
    {
        if (!empty($object->Recognition)){
            $keyword = trim($object->Recognition);
            $mediaid = trim($object->MediaID);
        }else{
            $keyword = trim($object->Content);
        }
   }

需要说的是，受个体口音，重音，音调，音量和发音的速度，环境噪音以及语义理解等诸多因素的影响，语音识别目前很难做到百分之百的准确率。，等待者语音技术的发展会有不一样的结果吧 - ^_ ^ -

这里写图片描述

语音识别 示例代码如下：

<?php

define("TOKEN", "weixin");

$wechatObj = new wechatCallbackapiTest();
if (!isset($_GET['echostr'])) {
    $wechatObj->responseMsg();
}else{
    $wechatObj->valid();
}

class wechatCallbackapiTest
{
    //验证消息
    public function valid()
    {
        $echoStr = $_GET["echostr"];
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

    //检查签名
    private function checkSignature()
    {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];
        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode($tmpArr);
        $tmpStr = sha1($tmpStr);

        if($tmpStr == $signature){
            return true;
        }else{
            return false;
        }
    }

    //响应消息
    public function responseMsg()
    {

        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        if (!empty($postStr)){
            $this->logger("R ".$postStr);
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $RX_TYPE = trim($postObj->MsgType);

            switch ($RX_TYPE)
            {
                case "voice":
                case "text":
                    $result = $this->receiveText($postObj);
                    break;
            }
            $this->logger("T ".$result);
            echo $result;
        }else {
            echo "";
            exit;
        }
    }

    //接收文本、语音消息
    private function receiveText($object)
    {
        if (!empty($object->Recognition)){
            $keyword = trim($object->Recognition);
            $mediaid = trim($object->MediaID);
        }else{
            $keyword = trim($object->Content);
        }

        switch ($keyword)
        {
            case "文本":
                $content = "这是个文本消息";
                break;
            case "图文":
            case "单图文":
                $content = array();
                $content[] = array("Title"=>"单图文标题",  "Description"=>"单图文内容", "PicUrl"=>"http://discuz.comli.com/weixin/weather/icon/cartoon.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
                break;
            case "多图文":
                $content = array();
                $content[] = array("Title"=>"多图文1标题", "Description"=>"", "PicUrl"=>"http://discuz.comli.com/weixin/weather/icon/cartoon.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
                $content[] = array("Title"=>"多图文2标题", "Description"=>"", "PicUrl"=>"http://d.hiphotos.bdimg.com/wisegame/pic/item/f3529822720e0cf3ac9f1ada0846f21fbe09aaa3.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
                $content[] = array("Title"=>"多图文3标题", "Description"=>"", "PicUrl"=>"http://g.hiphotos.bdimg.com/wisegame/pic/item/18cb0a46f21fbe090d338acc6a600c338644adfd.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
                break;
            case "音乐":
                $content = array("Title"=>"最炫民族风", "Description"=>"歌手：凤凰传奇", "MusicUrl"=>"http://121.199.4.61/music/zxmzf.mp3", "HQMusicUrl"=>"http://121.199.4.61/music/zxmzf.mp3");
                break;
            default:
                $content = date("Y-m-d H:i:s",time())."\n技术支持 方倍工作室";
                break;
        }
        if(is_array($content)){
            if (isset($content[0]['PicUrl'])){
                $result = $this->transmitNews($object, $content);
            }else if (isset($content['MusicUrl'])){
                $result = $this->transmitMusic($object, $content);
            }
        }else{
            $result = $this->transmitText($object, $content);
        }
        return $result;
    }

    //回复文本消息
    private function transmitText($object, $content)
    {
        $textTpl = "<xml>
                        <ToUserName><![CDATA[%s]]></ToUserName>
                        <FromUserName><![CDATA[%s]]></FromUserName>
                        <CreateTime>%s</CreateTime>
                        <MsgType><![CDATA[text]]></MsgType>
                        <Content><![CDATA[%s]]></Content>
                    </xml>";
        $result = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time(), $content);
        return $result;
    }

    //回复图文消息
    private function transmitNews($object, $newsArray)
    {
        if(!is_array($newsArray)){
            return;
        }
        $itemTpl = "    <item>
                            <Title><![CDATA[%s]]></Title>
                            <Description><![CDATA[%s]]></Description>
                            <PicUrl><![CDATA[%s]]></PicUrl>
                            <Url><![CDATA[%s]]></Url>
                        </item>";
        $item_str = "";
        foreach ($newsArray as $item){
            $item_str .= sprintf($itemTpl, $item['Title'], $item['Description'], $item['PicUrl'], $item['Url']);
        }
        $newsTpl = "<xml>
                        <ToUserName><![CDATA[%s]]></ToUserName>
                        <FromUserName><![CDATA[%s]]></FromUserName>
                        <CreateTime>%s</CreateTime>
                        <MsgType><![CDATA[news]]></MsgType>
                        <Content><![CDATA[]]></Content>
                        <ArticleCount>%s</ArticleCount>
                        <Articles>
                        $item_str</Articles>
                    </xml>";

        $result = sprintf($newsTpl, $object->FromUserName, $object->ToUserName, time(), count($newsArray));
        return $result;
    }

    //回复音乐消息
    private function transmitMusic($object, $musicArray)
    {
        $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
                    </xml>";

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

    //日志记录
    private function logger($log_content)
    {
        if(isset($_SERVER['HTTP_APPNAME'])){   //SAE
            sae_set_display_errors(false);
            sae_debug($log_content);
            sae_set_display_errors(true);
        }else if($_SERVER['REMOTE_ADDR'] != "127.0.0.1"){ //LOCAL
            $max_size = 10000;
            $log_filename = "log.xml";
            if(file_exists($log_filename) and (abs(filesize($log_filename)) > $max_size)){unlink($log_filename);}
            file_put_contents($log_filename, date('H:i:s')." ".$log_content."\r\n", FILE_APPEND);
        }
    }
}
?>

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