微信公众平台开发入门教程（四）获取接收消息

定义消息类型处理函数

在接收到的消息中根据消息类型，定义不同的消息处理函数，

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 "image":
                $resultStr = $this->receiveImage($postObj);
                break;
            case "location":
                $resultStr = $this->receiveLocation($postObj);
                break;
            case "voice":
                $resultStr = $this->receiveVoice($postObj);
                break;
            case "video":
                $resultStr = $this->receiveVideo($postObj);
                break;
            case "link":
                $resultStr = $this->receiveLink($postObj);
                break;
            case "event":
                $resultStr = $this->receiveEvent($postObj);
                break;
            default:
                $resultStr = "unknow msg type: ".$RX_TYPE;
                break;
        }
        echo $resultStr;
    }else {
        echo "";
        exit;
    }
}

  原文：http://www.cnblogs.com/txw1958/p/wechat-tutorial.html 

定义并实现回复函数

在这里，我们先全部用文本消息回复实现

    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;
    }

  原文：http://www.cnblogs.com/txw1958/p/wechat-tutorial.html 

各种消息类型函数实现

1、事件消息

    private function receiveEvent($object)
    {
        $contentStr = "";
        switch ($object->Event)
        {
            case "subscribe":
                $contentStr = "欢迎关注方倍工作室";
                break;
            case "unsubscribe":
                $contentStr = "";
                break;
            case "CLICK":
                switch ($object->EventKey)
                {
                    default:
                        $contentStr = "你点击了菜单: ".$object->EventKey;
                        break;
                }
                break;
            default:
                $contentStr = "receive a new event: ".$object->Event;
                break;
        }
        $resultStr = $this->transmitText($object, $contentStr);
        return $resultStr;
    }

2、文本消息

    private function receiveText($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是文本，内容为：".$object->Content;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

3、图片消息

    private function receiveImage($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是图片，地址为：".$object->PicUrl;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

4、语音消息

    private function receiveVoice($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是语音，媒体ID为：".$object->MediaId;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

5、视频消息

    private function receiveVideo($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是视频，媒体ID为：".$object->MediaId;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

6、位置消息

    private function receiveLocation($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是位置，纬度为：".$object->Location_X."；经度为：".$object->Location_Y."；缩放级别为：".$object->Scale."；位置为：".$object->Label;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

7、链接消息

    private function receiveLink($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是链接，标题为：".$object->Title."；内容为：".$object->Description."；链接地址为：".$object->Url;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

完整代码

/*
方倍工作室 
http://www.cnblogs.com/txw1958/
*/

define("TOKEN", "pondbay");

$wechatObj = new wechatCallbackapiTest();
if (isset($_GET['echostr'])) {
    $wechatObj->valid();
}else{
    $wechatObj->responseMsg();
}

class wechatCallbackapiTest
{
    public function valid()
    {
        $echoStr = $_GET["echostr"];
        if($this->checkSignature()){
            echo $echoStr;
            exit;
        }
    }

    private function checkSignature()
    {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];

        $token = TOKEN;
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr);
        $tmpStr = implode( $tmpArr );
        $tmpStr = sha1( $tmpStr );

        if( $tmpStr == $signature ){
            return true;
        }else{
            return false;
        }
    }

    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 "image":
                    $resultStr = $this->receiveImage($postObj);
                    break;
                case "location":
                    $resultStr = $this->receiveLocation($postObj);
                    break;
                case "voice":
                    $resultStr = $this->receiveVoice($postObj);
                    break;
                case "video":
                    $resultStr = $this->receiveVideo($postObj);
                    break;
                case "link":
                    $resultStr = $this->receiveLink($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)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是文本，内容为：".$object->Content;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

    private function receiveImage($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是图片，地址为：".$object->PicUrl;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

    private function receiveLocation($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是位置，纬度为：".$object->Location_X."；经度为：".$object->Location_Y."；缩放级别为：".$object->Scale."；位置为：".$object->Label;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

    private function receiveVoice($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是语音，媒体ID为：".$object->MediaId;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

    private function receiveVideo($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是视频，媒体ID为：".$object->MediaId;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

    private function receiveLink($object)
    {
        $funcFlag = 0;
        $contentStr = "你发送的是链接，标题为：".$object->Title."；内容为：".$object->Description."；链接地址为：".$object->Url;
        $resultStr = $this->transmitText($object, $contentStr, $funcFlag);
        return $resultStr;
    }

    private function receiveEvent($object)
    {
        $contentStr = "";
        switch ($object->Event)
        {
            case "subscribe":
                $contentStr = "欢迎关注方倍工作室";
                break;
            case "unsubscribe":
                $contentStr = "";
                break;
            case "CLICK":
                switch ($object->EventKey)
                {
                    default:
                        $contentStr = "你点击了: ".$object->EventKey;
                        break;
                }
                break;
            default:
                $contentStr = "receive a new event: ".$object->Event;
                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;
    }