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;
   }
}