微信开发系列教程（2）

简答的自动回复消息完成了，有很多人都不知道关注自动发送给用户消息是怎么实现的，那么我今天分享一下关注成功后自动发送消息的实现。

看到微信api里面也有介绍到事件推送，那么这个关注事件是如何使用的呢？ 今天不废话，直接上代码：

<?php
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->responseMsg();
class wechatCallbackapiTest {
    public function responseMsg() {
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        if(!empty($postStr)) {
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $RX_TYPE = trim($postObj->MsgType);
                                    
            switch($RX_TYPE) {
                case "text" :
                    $resultStr = $this->receiveText($postObj);
                    break;
                case "event" :
                    $resultStr = $this->receiveEvent($postObj);
                    break;
                default :
                    $resultStr = "unknow msg type: " . $RX_TYPE;
                    break;
            }
            echo $resultStr;
        } else {
            echo "";
            exit();
        }
    }
    private function receiveText($object) {
        if (!empty($object)){
                $fromUsername = $object->FromUserName;
                $toUsername = $object->ToUserName;
                $keyword = trim($object->Content);
                $time = time();
                                    
                //自动回复图文消息
                $textTpl = "<xml>
                             <ToUserName><![CDATA[%s]]></ToUserName>
                             <FromUserName><![CDATA[%s]]></FromUserName>
                             <CreateTime>%s</CreateTime>
                             <MsgType><![CDATA[%s]]></MsgType>
                                                     
                             <ArticleCount>3</ArticleCount>
                             <Articles>
                             <item>
                             <Title><![CDATA[测试标题1]]></Title>
                             <Description><![CDATA[测试内容啊1！]]></Description>
                             <PicUrl><![CDATA[http://weixin.comsenz-service.com/20.jpg]]></PicUrl>
                             <Url><![CDATA[http://www.baidu.com]]></Url>
                             </item>
                             <item>
                             <Title><![CDATA[哈哈，标题]]></Title>
                             <Description><![CDATA[内容标题]]></Description>
                             <PicUrl><![CDATA[http://weixin.comsenz-service.com/540.png]]></PicUrl>
                             <Url><![CDATA[http://www.discuz.com]]></Url>
                             </item>
                             <item>
                             <Title><![CDATA[12345哈哈，标题]]></Title>
                             <Description><![CDATA[798465789内容标题]]></Description>
                             <PicUrl><![CDATA[http://weixin.comsenz-service.com/20.jpg]]></PicUrl>
                             <Url><![CDATA[http://www.google.com]]></Url>
                             </item>
                             </Articles>
                             <FuncFlag>1</FuncFlag>
                             </xml> ";
                                        
                if(!empty( $keyword )){
                    $msgType = "news";  //类型 news:图文消息、text:文本消息 event:事件
                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    echo $resultStr;
                }else{
                    echo "Input something...";
                }
        }else {
            echo "";
            exit;
        }
    }
    private function receiveEvent($object) {
        $contentStr = "";
        switch($object->Event) {
            case "subscribe" :
                $contentStr = "欢迎关注社区管家！我们可以常联系了！！";
                break;
        }
        $resultStr = $this->transmitText($object, $contentStr);
        return $resultStr;
    }
    private function transmitText($object, $content, $flag = 0) {
        $textTpl = "<xml>
                    <ToUserName><![CDATA[%s]]></ToUserName>
                    <FromUserName><![CDATA[%s]]></FromUserName>
                    <CreateTime>%s</CreateTime>
                    <MsgType><![CDATA[text]]></MsgType>
                    <Content><![CDATA[%s]]></Content>
                    <FuncFlag>%d</FuncFlag>
                    </xml>";
        $resultStr = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time(), $content, $flag);
        return $resultStr;
    }
}
?>

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