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在这篇微信公众平台开发教程中，我们将介绍如何使用开发模式实现多客服系统。
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
/*
方倍工作室
CopyRight 2014 All Rights Reserved
*/
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>
<Title><![CDATA[%s]]></Title>
<Description><![CDATA[%s]]&