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地址为：http://www.sinacloud.com

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：

 <?php
 header('Content-type:text/html;charset=utf-8');
 define("TOKEN", "这里是你在微信那里的token");
 $wechatObj = new wechatCallbackapiTest();
 $wechatObj->valid();

 class wechatCallbackapiTest {
     public function valid()
     {
         
　　　　　　 //这里是认证过程
　　　　　　　$echoStr = $_GET["echostr"];
         if($this->checkSignature() && $echoStr) {
             echo $echoStr;
             exit;
         } else {
             $this->responseMsg();//当认证成功后执行下面的代码
         }
     }

     private function responseMsg() {

         $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
         if (!empty($postStr)) {
                 libxml_disable_entity_loader(true);
                 $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>";
                 $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                 //第一次关注的时候
                 if (strtolower($postObj->MsgType) == 'event') {
                     if (strtolower($postObj->Event) == 'subscribe') {
                         $toUsername = $postObj->ToUserName;
                         $fromUsername = $postObj->FromUserName;
                         $time = time();
                         $msgType = "text";
                         $contentStr = "<<Welcome attention to life is elsewhere!>>";
                         $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                         echo $resultStr;
                     }
                 //关键字文本回复
                 } else if ( strtolower($postObj->MsgType) == 'text' ) {
                     if ( $postObj->Content == 'imooc' ) {
                         $toUsername = $postObj->ToUserName;
                         $fromUsername = $postObj->FromUserName;
                         $time = time();
                         $msgType = "text";
                         $contentStr = "imooc is very good";
                         $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                         echo $resultStr;
                         exit;
                     } else if ( $postObj->Content == '美丽说' ) {
                         $array = array(
                             array(
                               'title' => 'meilishuo',
                               'description'=> 'meilishuo is very good',
                               'picurl' => 'http://d05.res.meilishuo.net/img/_o/67/24/65bc4ebfe22d0c2eca1702c9736c_117_43.ch.png',
                               'url' => 'http://www.meilishuo.com'
                             )
                         );
                         $imageTpl = "<xml>
                                     <ToUserName><![CDATA[%s]]></ToUserName>
                                     <FromUserName><![CDATA[%s]]></FromUserName>
                                     <CreateTime>%s</CreateTime>
                                     <MsgType><![CDATA[%s]]></MsgType>
                                     <ArticleCount>".count($array)."</ArticleCount>
                                     <Articles>";
                         foreach ($array as $key => $value) {
                             $imageTpl .=
                                     "<item>
                                     <Title><![CDATA[".$value['title']."]]></Title>
                                     <Description><![CDATA[".$value['description']."]]></Description>
                                     <PicUrl><![CDATA[".$value['picurl']."]]></PicUrl>
                                     <Url><![CDATA[".$value['url']."]]></Url>
                                     </item>";
                         }
                         $imageTpl .= "</Articles></xml>";
                         $toUsername = $postObj->ToUserName;
                         $fromUsername = $postObj->FromUserName;
                         $time = time();
                         $msgType = "news";
                         $resultStr = sprintf($imageTpl, $fromUsername, $toUsername, $time, $msgType);
                         echo $resultStr;
                         exit;
                     }
         }

         } else {
             echo "";
             exit;
         }

     }

     private function checkSignature() {
         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, $nonce);
         sort($tmpArr, SORT_STRING);
         $tmpStr = implode( $tmpArr );
         $tmpStr = sha1( $tmpStr );
         return ($tmpStr == $signature) ? true : false;
    }
 }