PHP-微信公眾平台開發-接收用戶輸入消息類型並響應

<?php
// 該代碼塊用於接收用戶消息，根據用戶輸入的消息類型進行判斷，文本，圖片，視頻，位置，鏈接，語音等，並取得值，處理后給予響應。
// 接收用戶消息
// 微信公眾賬號接收到用戶的消息類型判斷
//

define("TOKEN", "weixin");

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

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);

            //用戶發送的消息類型判斷
            switch ($RX_TYPE)
            {
                case "text":    //文本消息
                    $result = $this->receiveText($postObj);
                    break;
                case "image":   //圖片消息
                    $result = $this->receiveImage($postObj);
                    break;

                case "voice":   //語音消息
                    $result = $this->receiveVoice($postObj);
                    break;
                case "video":   //視頻消息
                    $result = $this->receiveVideo($postObj);
                    break;
                case "location"://位置消息
                    $result = $this->receiveLocation($postObj);
                    break;
                case "link":    //鏈接消息
                    $result = $this->receiveLink($postObj);
                    break;
                default:
                    $result = "unknow msg type: ".$RX_TYPE;
                    break;
            }
            echo $result;
        }else {
            echo "";
            exit;
        }
    }

    /*
     * 接收文本消息
     */
    private function receiveText($object)
    {
        $content = "你發送的是文本，內容為：".$object->Content;
        $result = $this->transmitText($object, $content);
        return $result;
    }

    /*
     * 接收圖片消息
     */
    private function receiveImage($object)
    {
        $content = "你發送的是圖片，地址為：".$object->PicUrl;
        $result = $this->transmitText($object, $content);
        return $result;
    }

    /*
     * 接收語音消息
     */
    private function receiveVoice($object)
    {
        $content = "你發送的是語音，媒體ID為：".$object->MediaId;
        $result = $this->transmitText($object, $content);
        return $result;
    }

    /*
     * 接收視頻消息
     */
    private function receiveVideo($object)
    {
        $content = "你發送的是視頻，媒體ID為：".$object->MediaId;
        $result = $this->transmitText($object, $content);
        return $result;
    }

    /*
     * 接收位置消息
     */
    private function receiveLocation($object)
    {
        $content = "你發送的是位置，緯度為：".$object->Location_X."；經度為：".$object->Location_Y."；縮放級別為：".$object->Scale."；位置為：".$object->Label;
        $result = $this->transmitText($object, $content);
        return $result;
    }

    /*
     * 接收鏈接消息
     */
    private function receiveLink($object)
    {
        $content = "你發送的是鏈接，標題為：".$object->Title."；內容為：".$object->Description."；鏈接地址為：".$object->Url;
        $result = $this->transmitText($object, $content);
        return $result;
    }

    /*
     * 回復文本消息
     */
    private function transmitText($object, $content)
    {
        $textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[%s]]></Content>
</xml>";
        $result = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time(), $content);
        return $result;
    }
}
?>