PHP实现微信公众账号开发

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 }