新用户关注微信公众平台，将产生一个订阅事件，即subscribe事件，默认代码中没有对这一事件进行相应回复处理。
在新用户关注公众平台后，可能想知道该平台提供了哪些功能，以及怎样使用该平台，通俗一点讲就是该平台的“使用说明书”。
本文将详细讲述对subscribe事件的处理过程，回复相应信息提升交互性。
微信目前提供了五种消息类型，分别为：
接收到消息后，首先需要对消息类型做出判断，然后再针对不同类型的消息做出处理。在事件推送中，事件类型又分为三种，subscribe（订阅）、unsubscribe（取消订阅）、CLICK（自定义菜单点击事件），还需要再加一次判断；判断为subscribe事件后，根据设定好的欢迎消息，回复给用户。
<span $postObj</span> = <span simplexml_load_string</span>(<span $postStr</span>, 'SimpleXMLElement',<span LIBXML_NOCDATA);
</span><span $RX_TYPE</span> = <span trim</span>(<span $postObj</span>-><span MsgType);
</span><span switch</span>(<span $RX_TYPE</span><span )
{
</span><span case</span> "text":
<span $resultStr</span> = <span $this</span>->handleText(<span $postObj</span><span );
</span><span break</span><span ;
</span><span case</span> "event":
<span $resultStr</span> = <span $this</span>->handleEvent(<span $postObj</span><span );
</span><span break</span><span ;
</span><span default</span>:
<span $resultStr</span> = "Unknow msg type: ".<span $RX_TYPE</span><span ;
</span><span break</span><span ;
}</span>说明：
$RX_TYPE = trim($postObj->MsgType); 得到消息类型；
case "text":
$resultStr = $this->handleText($postObj); 使用handleText() 函数处理文本消息；
case "event":
$resultStr = $this->handleEvent($postObj); 使用handleEvent() 函数处理事件推送；
<span switch</span> (<span $object</span>-><span Event)
{
</span><span case</span> "subscribe":
<span $contentStr</span> = "感谢您关注【卓锦苏州】"."\n"."微信号：zhuojinsz"."\n"."卓越锦绣，名城苏州，我们为您提供苏州本地生活指南，苏州相关信息查询，做最好的苏州微信平台。"."\n"."目前平台功能如下："."\n"."【1】 查天气，如输入：苏州天气"."\n"."【2】 查公交，如输入：苏州公交178"."\n"."【3】 翻译，如输入：翻译I love you"."\n"."【4】 苏州信息查询，如输入：苏州观前街"."\n"."更多内容，敬请期待..."<span ;
</span><span break</span><span ;
</span><span default</span> :
<span $contentStr</span> = "Unknow Event: ".<span $object</span>-><span Event;
</span><span break</span><span ;
}</span>说明：
如果是subscribe事件，设定回复内容为“感谢您关注【卓锦苏州】...”；
<?<span php
</span><span /*</span><span *
* wechat php test
</span><span */</span>
<span //</span><span define your token</span>
<span define</span>("TOKEN", "zhuojin"<span );
</span><span $wechatObj</span> = <span new</span><span wechatCallbackapiTest();
</span><span $wechatObj</span>-><span responseMsg();
</span><span //</span><span $wechatObj->valid();</span>
<span class</span><span wechatCallbackapiTest
{
</span><span /*</span><span public function valid()
{
$echoStr = $_GET["echostr"];
//valid signature , option
if($this->checkSignature()){
echo $echoStr;
exit;
}
}</span><span */</span>
<span public</span> <span function</span><span responseMsg()
{
</span><span //</span><span get post data, May be due to the different environments</span>
<span $postStr</span> = <span $GLOBALS</span>["HTTP_RAW_POST_DATA"<span ];
</span><span //</span><span extract post data</span>
<span if</span> (!<span empty</span>(<span $postStr</span><span )){
</span><span $postObj</span> = <span simplexml_load_string</span>(<span $postStr</span>, 'SimpleXMLElement',<span LIBXML_NOCDATA);
</span><span $RX_TYPE</span> = <span trim</span>(<span $postObj</span>-><span MsgType);
</span><span switch</span>(<span $RX_TYPE</span><span )
{
</span><span case</span> "text":
<span $resultStr</span> = <span $this</span>->handleText(<span $postObj</span><span );
</span><span break</span><span ;
</span><span case</span> "event":
<span $resultStr</span> = <span $this</span>->handleEvent(<span $postObj</span><span );
</span><span break</span><span ;
</span><span default</span>:
<span $resultStr</span> = "Unknow msg type: ".<span $RX_TYPE</span><span ;
</span><span break</span><span ;
}
</span><span echo</span> <span $resultStr</span><span ;
}</span><span else</span><span {
</span><span echo</span> ""<span ;
</span><span exit</span><span ;
}
}
</span><span public</span> <span function</span> handleText(<span $postObj</span><span )
{
</span><span $fromUsername</span> = <span $postObj</span>-><span FromUserName;
</span><span $toUsername</span> = <span $postObj</span>-><span ToUserName;
</span><span $keyword</span> = <span trim</span>(<span $postObj</span>-><span Content);
</span><span $time</span> = <span time</span><span ();
</span><span $textTpl</span> = "<span <xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[%s]]></MsgType>
<Content><![CDATA[%s]]></Content>
<FuncFlag>0</FuncFlag>
</xml></span>"<span ;
</span><span if</span>(!<span empty</span>( <span $keyword</span><span ))
{
</span><span $msgType</span> = "text"<span ;
</span><span $contentStr</span> = "Welcome to wechat world!"<span ;
</span><span $resultStr</span> = <span sprintf</span>(<span $textTpl</span>, <span $fromUsername</span>, <span $toUsername</span>, <span $time</span>, <span $msgType</span>, <span $contentStr</span><span );
</span><span echo</span> <span $resultStr</span><span ;
}</span><span else</span><span {
</span><span echo</span> "Input something..."<span ;
}
}
</span><span public</span> <span function</span> handleEvent(<span $object</span><span )
{
</span><span $contentStr</span> = ""<span ;
</span><span switch</span> (<span $object</span>-><span Event)
{
</span><span case</span> "subscribe":
<span $contentStr</span> = "感谢您关注【卓锦苏州】"."\n"."微信号：zhuojinsz"."\n"."卓越锦绣，名城苏州，我们为您提供苏州本地生活指南，苏州相关信息查询，做最好的苏州微信平台。"."\n"."目前平台功能如下："."\n"."【1】 查天气，如输入：苏州天气"."\n"."【2】 查公交，如输入：苏州公交178"."\n"."【3】 翻译，如输入：翻译I love you"."\n"."【4】 苏州信息查询，如输入：苏州观前街"."\n"."更多内容，敬请期待..."<span ;
</span><span break</span><span ;
</span><span default</span> :
<span $contentStr</span> = "Unknow Event: ".<span $object</span>-><span Event;
</span><span break</span><span ;
}
</span><span $resultStr</span> = <span $this</span>->responseText(<span $object</span>, <span $contentStr</span><span );
</span><span return</span> <span $resultStr</span><span ;
}
</span><span public</span> <span function</span> responseText(<span $object</span>, <span $content</span>, <span $flag</span>=0<span )
{
</span><span $textTpl</span> = "<span <xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[%s]]></Content>
<FuncFlag>%d</FuncFlag>
</xml></span>"<span ;
</span><span $resultStr</span> = <span sprintf</span>(<span $textTpl</span>, <span $object</span>->FromUserName, <span $object</span>->ToUserName, <span time</span>(), <span $content</span>, <span $flag</span><span );
</span><span return</span> <span $resultStr</span><span ;
}
</span><span private</span> <span function</span><span checkSignature()
{
</span><span $signature</span> = <span $_GET</span>["signature"<span ];
</span><span $timestamp</span> = <span $_GET</span>["timestamp"<span ];
</span><span $nonce</span> = <span $_GET</span>["nonce"<span ];
</span><span $token</span> =<span TOKEN;
</span><span $tmpArr</span> = <span array</span>(<span $token</span>, <span $timestamp</span>, <span $nonce</span><span );
</span><span sort</span>(<span $tmpArr</span><span );
</span><span $tmpStr</span> = <span implode</span>( <span $tmpArr</span><span );
</span><span $tmpStr</span> = <span sha1</span>( <span $tmpStr</span><span );
</span><span if</span>( <span $tmpStr</span> == <span $signature</span><span ){
</span><span return</span> <span true</span><span ;
}</span><span else</span><span {
</span><span return</span> <span false</span><span ;
}
}
}
</span>?>
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