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来源： 微信公众号开发之语音消息识别 – 洛水3000 – 博客园
1.开通语音识别（默认关闭）
2.语音识别
请注意，开通语音识别后，用户每次发送语音给公众号时，微信会在推送的语音消息XML数据包中，增加一个Recognition字段（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）。开启语音识别后的语音XML数据包如下：
1 <?php
2 /**
3 * wechat php test
4 */
5
6 //define your token
7 define("TOKEN", "weixin");
8 $wechatObj = new wechatCallbackapiTest();
9 //$wechatObj->valid();//接口验证
10 $wechatObj->responseMsg();//调用回复消息方法
11 class wechatCallbackapiTest
12 {
13 public function valid()
14 {
15 $echoStr = $_GET["echostr"];
16
17 //valid signature , option
18 if($this->checkSignature()){
19 echo $echoStr;
20 exit;
21 }
22 }
23
24 public function responseMsg()
25 {
26 //get post data, May be due to the different environments
27 $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
28
29 //extract post data
30 if (!empty($postStr)){
31 /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
32 the best way is to check the validity of xml by yourself */
33 libxml_disable_entity_loader(true);
34 $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
35 $fromUsername = $postObj->FromUserName;
36 $toUsername = $postObj->ToUserName;
37 $keyword = trim($postObj->Content);
38 $time = time();
39 $msgType = $postObj->MsgType;//消息类型
40 $event = $postObj->Event;//时间类型，subscribe（订阅）、unsubscribe（取消订阅）
41
42 $textTpl = "<xml>
43 <ToUserName><![CDATA[%s]]></ToUserName>
44 <FromUserName><![CDATA[%s]]></FromUserName>
45 <CreateTime>%s</CreateTime>
46 <MsgType><![CDATA[%s]]></MsgType>
47 <Content><![CDATA[%s]]></Content>
48 <FuncFlag>0</FuncFlag>
49 </xml>";
50
51 switch($msgType){
52 case "event":
53 if($event=="subscribe"){
54 $contentStr = "Hi,欢迎关注海仙日用百货!"."\n"."回复数字'1',了解店铺地址."."\n"."回复数字'2',了解商品种类.";
55 }
56 break;
57 case "text"://文本消息
58 switch($keyword){
59 case "1":
60 $contentStr = "店铺地址："."\n"."杭州市江干区.";
61 break;
62 case "2":
63 $contentStr = "商品种类:"."\n"."杯子、碗、棉签、水桶、垃圾桶、洗碗巾(刷)、拖把、扫把、"
64 ."衣架、粘钩、牙签、垃圾袋、保鲜袋(膜)、剪刀、水果刀、饭盒等.";
65 break;
66 default:
67 $contentStr = "对不起,你的内容我会稍后回复";
68 }
69 break;
70 case "voice"://语音消息
71 //语音识别
72 $recognition = $postObj->Recognition;
73 $format = $postObj->Format;
74 $contentStr = "你发送的是语音消息"."\n"."语音格式为:"."\n".$format."\n"."语音内容为:"."\n".$recognition;
75 break;
76 }
77 $msgType = "text";
78 $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
79 echo $resultStr;
80 }else {
81 echo "";
82 exit;
83 }
84 }
85
86 private function checkSignature()
87 {
88 // you must define TOKEN by yourself
89 if (!defined("TOKEN")) {
90 throw new Exception('TOKEN is not defined!');
91 }
92
93 $signature = $_GET["signature"];
94 $timestamp = $_GET["timestamp"];
95 $nonce = $_GET["nonce"];
96
97 $token = TOKEN;
98 $tmpArr = array($token, $timestamp, $nonce);
99 // use SORT_STRING rule
100 sort($tmpArr, SORT_STRING);
101 $tmpStr = implode( $tmpArr );
102 $tmpStr = sha1( $tmpStr );
103
104 if( $tmpStr == $signature ){
105 return true;
106 }else{
107 return false;
108 }
109 }
110 }
111
112
113 ?>
