微信公众平台开发 多客服

本文分为以下三个部分：

回复多客服消息

触发多客服会话

其他说明

一、回复多客服消息

在新的微信协议中，开发模式也可以接入客服系统。 开发者如果需要让用户使用客服系统，需要在接收到用户发送的消息时，返回一个MsgType为transfer_customer_service的消息，微信服务器在收到这条消息时，会把用户这次发送的和以后一段时间内发送的消息转发客服系统。

返回的消息举例如下

<xml>
    <ToUserName><![CDATA[touser]]></ToUserName>
    <FromUserName><![CDATA[fromuser]]></FromUserName>
    <CreateTime>1399197672</CreateTime>
    <MsgType><![CDATA[transfer_customer_service]]></MsgType>
</xml>

该消息的实现如下

//回复多客服消息
    private function transmitService($object)
    {
        $xmlTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[transfer_customer_service]]></MsgType>
</xml>";
        $result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, time());
        return $result;
    }

二、触发多客服会话

一般情况下，用户想要咨询问题是，经常会问“你好”，“在吗”，这样的问题。

我们以这些词为触发关键词，当用户发送的文本消息内容中包含这些词的时候，就返回多客服消息给用户（用户在微信端感觉不到任何内容，但微信公众账号会将用户本次及以后一段时间的消息都转发到客服）。

实现代码如下：

//接收文本消息
    private function receiveText($object)
    {
        $keyword = trim($object->Content);
        if (strstr($keyword, "投诉") || strstr($keyword, "你好") || strstr($keyword, "在吗")){
            $result = $this->transmitService($object);
        }

        return $result;
    }

三、完整代码

<?php
define("TOKEN", "weixin");

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

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

    //检查签名
    private function checkSignature()
    {
        $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);

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

    //响应消息
    public function responseMsg()
    {
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        if (!empty($postStr)){
            $this->logger("R ".$postStr);
            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $RX_TYPE = trim($postObj->MsgType);

            switch ($RX_TYPE)
            {
                case "event":
                    $result = $this->receiveEvent($postObj);
                    break;
                case "text":
                    $result = $this->receiveText($postObj);
                    break;
            }
            $this->logger("T ".$result);
            echo $result;
        }else {
            echo "";
            exit;
        }
    }

    //接收事件消息
    private function receiveEvent($object)
    {
        switch ($object->Event)
        {
            case "subscribe":
                $content[] = array("Title" =>"欢迎关注方倍工作室", "Description" =>"使用方法：\n1.发送快递单号,例如6367532560,可查询快递详情", "PicUrl" =>"http://www.3856.cc/weixin/weixin/logo.jpg", "Url" =>"");
                break;
            default:
                $content = "receive a new event: ".$object->Event;
                break;
        }
        
        if(is_array($content)){
            if (isset($content[0])){
                $result = $this->transmitNews($object, $content);
            }else if (isset($content['MusicUrl'])){
                $result = $this->transmitMusic($object, $content);
            }
        }else{
            $result = $this->transmitText($object, $content);
        }
        return $result;
    }

    //接收文本消息
    private function receiveText($object)
    {
        $keyword = trim($object->Content);
        if($keyword == "时间" || $keyword == "测试"){
            $content = date("Y-m-d H:i:s",time());
            $result = $this->transmitText($object, $content);
        }
        //触发多客服模式
        else if (strstr($keyword, "您好") || strstr($keyword, "你好") || strstr($keyword, "在吗") || strstr($keyword, "有人吗")){
            $result = $this->transmitService($object);
            return $result;
        }
        return $result;
    }

    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;
    }

    private function transmitNews($object, $newsArray)
    {
        if(!is_array($newsArray)){
            return;
        }
        $itemTpl = "    <item>
        <Title><![CDATA[%s]]></Title>
        <Description><![CDATA[%s]]></Description>
        <PicUrl><![CDATA[%s]]></PicUrl>
        <Url><![CDATA[%s]]></Url>
    </item>
";
        $item_str = "";
        foreach ($newsArray as $item){
            $item_str .= sprintf($itemTpl, $item['Title'], $item['Description'], $item['PicUrl'], $item['Url']);
        }
        $newsTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[news]]></MsgType>
<Content><![CDATA[]]></Content>
<ArticleCount>%s</ArticleCount>
<Articles>
$item_str</Articles>
</xml>";

        $result = sprintf($newsTpl, $object->FromUserName, $object->ToUserName, time(), count($newsArray));
        return $result;
    }

    private function transmitMusic($object, $musicArray)
    {
        $itemTpl = "<Music>
    <Tit