1、首先需要一个可以外网访问的接口url。
我这里是申请的新浪免费云服务器，http://xxxxx.applinzi.com/wx.php,具体自己可以去新浪云中心申请
2、去微信公众账号申请个人的公众账号，地址为：https://mp.weixin.qq.com，然后进入到左侧菜单开发里面选择基本配置。
3、点击修改配置，填写必要的信息，认证如下图：
需要在wx.php里面写入认证代码，具体代码下文会提供。
4、等待认证成功后，启用配置
附详细代码：
1 <?php
2 header('Content-type:text/html;charset=utf-8');
3 define("TOKEN", "这里是你在微信那里的token");
4 $wechatObj = new wechatCallbackapiTest();
5 $wechatObj->valid();
6
7 class wechatCallbackapiTest {
8 public function valid()
9 {
10
//这里是认证过程
$echoStr = $_GET["echostr"];
11 if($this->checkSignature() && $echoStr) {
12 echo $echoStr;
13 exit;
14 } else {
15 $this->responseMsg();//当认证成功后执行下面的代码
16 }
17 }
18
19 private function responseMsg() {
20
21 $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
22 if (!empty($postStr)) {
23 libxml_disable_entity_loader(true);
24 $textTpl = "<xml>
25 <ToUserName><![CDATA[%s]]></ToUserName>
26 <FromUserName><![CDATA[%s]]></FromUserName>
27 <CreateTime>%s</CreateTime>
28 <MsgType><![CDATA[%s]]></MsgType>
29 <Content><![CDATA[%s]]></Content>
30 <FuncFlag>0</FuncFlag>
31 </xml>";
32 $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
33 //第一次关注的时候
34 if (strtolower($postObj->MsgType) == 'event') {
35 if (strtolower($postObj->Event) == 'subscribe') {
36 $toUsername = $postObj->ToUserName;
37 $fromUsername = $postObj->FromUserName;
38 $time = time();
39 $msgType = "text";
40 $contentStr = "<<Welcome attention to life is elsewhere!>>";
41 $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
42 echo $resultStr;
43 }
44 //关键字文本回复
45 } else if ( strtolower($postObj->MsgType) == 'text' ) {
46 if ( $postObj->Content == 'imooc' ) {
47 $toUsername = $postObj->ToUserName;
48 $fromUsername = $postObj->FromUserName;
49 $time = time();
50 $msgType = "text";
51 $contentStr = "imooc is very good";
52 $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
53 echo $resultStr;
54 exit;
55 } else if ( $postObj->Content == '美丽说' ) {
56 $array = array(
57 array(
58 'title' => 'meilishuo',
59 'description'=> 'meilishuo is very good',
60 'picurl' => 'http://d05.res.meilishuo.net/img/_o/67/24/65bc4ebfe22d0c2eca1702c9736c_117_43.ch.png',
61 'url' => 'http://www.meilishuo.com'
62 )
63 );
64 $imageTpl = "<xml>
65 <ToUserName><![CDATA[%s]]></ToUserName>
66 <FromUserName><![CDATA[%s]]></FromUserName>
67 <CreateTime>%s</CreateTime>
68 <MsgType><![CDATA[%s]]></MsgType>
69 <ArticleCount>".count($array)."</ArticleCount>
70 <Articles>";
71 foreach ($array as $key => $value) {
72 $imageTpl .=
73 "<item>
74 <Title><![CDATA[".$value['title']."]]></Title>
75 <Description><![CDATA[".$value['description']."]]></Description>
76 <PicUrl><![CDATA[".$value['picurl']."]]></PicUrl>
77 <Url><![CDATA[".$value['url']."]]></Url>
78 </item>";
79 }
80 $imageTpl .= "</Articles></xml>";
81 $toUsername = $postObj->ToUserName;
82 $fromUsername = $postObj->FromUserName;
83 $time = time();
84 $msgType = "news";
85 $resultStr = sprintf($imageTpl, $fromUsername, $toUsername, $time, $msgType);
86 echo $resultStr;
87 exit;
88 }
89 }
90
91 } else {
92 echo "";
93 exit;
94 }
95
96 }
97
98 private function checkSignature() {
99 if (!defined("TOKEN")) {
100 throw new Exception('TOKEN is not defined!');
101 }
102
103 $signature = $_GET["signature"];
104 $timestamp = $_GET["timestamp"];
105 $nonce = $_GET["nonce"];
106 $token = TOKEN;
107 $tmpArr = array($token, $timestamp, $nonce);
108 sort($tmpArr, SORT_STRING);
109 $tmpStr = implode( $tmpArr );
110 $tmpStr = sha1( $tmpStr );
111 return ($tmpStr == $signature) ? true : false;
112 }
113 }
