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-&gt;MsgType);
                                    
            switch($RX_TYPE) {
                case "text" :
                    $resultStr = $this-&gt;receiveText($postObj);
                    break;
                case "event" :
                    $resultStr = $this-&gt;receiveEvent($postObj);
                    break;
                default :
                    $resultStr = "unknow msg type: " . $RX_TYPE;
                    break;
            }
            echo $resultStr;
        } else {
            echo "";
            exit();
        }
    }
    private function receiveText($object) {
        if (!empty($object)){
                $fromUsername = $object-&gt;FromUserName;
                $toUsername = $object-&gt;ToUserName;
                $keyword = trim($object-&gt;Content);
                $time = time();
                                    
                //自动回复图文消息
                $textTpl = "<xml>
                             <tousername></tousername>
                             <fromusername></fromusername>
                             <createtime>%s</createtime>
                             <msgtype></msgtype>
                                                     
                             <articlecount>3</articlecount>
                             <articles>
                             <item>
                             <title></title>
                             <description></description>
                             <picurl></picurl>
                             <url></url>
                             </item>
                             <item>
                             <title></title>
                             <description></description>
                             <picurl></picurl>
                             <url></url>
                             </item>
                             <item>
                             <title></title>
                             <description></description>
                             <picurl></picurl>
                             <url></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-&gt;Event) {
            case "subscribe" :
                $contentStr = "欢迎关注社区管家！我们可以常联系了！！";
                break;
        }
        $resultStr = $this-&gt;transmitText($object, $contentStr);
        return $resultStr;
    }
    private function transmitText($object, $content, $flag = 0) {
        $textTpl = "<xml>
                    <tousername></tousername>
                    <fromusername></fromusername>
                    <createtime>%s</createtime>
                    <msgtype></msgtype>
                    <content></content>
                    <funcflag>%d</funcflag>
                    </xml>";
        $resultStr = sprintf($textTpl, $object-&gt;FromUserName, $object-&gt;ToUserName, time(), $content, $flag);
        return $resultStr;
    }
}
?&gt;

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