代码如下：

更新日志：

2013-01-01 版本1.0
2014-03-15 增加图片、视频、语音的内容回复
2014-04-09 增加菜单链接事件
2014-04-10 修改文本回复的判定方法

复制代码 代码如下:
<?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;
case "image":
$result = $this->receiveImage($postObj);
break;
case "location":
$result = $this->receiveLocation($postObj);
break;
case "voice":
$result = $this->receiveVoice($postObj);
break;
case "video":
$result = $this->receiveVideo($postObj);
break;
case "link":
$result = $this->receiveLink($postObj);
break;
default:
$result = "unknow msg type: ".$RX_TYPE;
break;
}
$this->logger("T ".$result);
echo $result;
}else {
echo "";
exit;
}
}

//接收事件消息
private function receiveEvent($object)
{
$content = "";
switch ($object->Event)
{
case "subscribe":
$content = "欢迎关注方倍工作室 ";
$content .= (!empty($object->EventKey))?("\n来自二维码场景 ".str_replace("qrscene_","",$object->EventKey)):"";
break;
case "unsubscribe":
$content = "取消关注";
break;
case "SCAN":
$content = "扫描场景 ".$object->EventKey;
break;
case "CLICK":
switch ($object->EventKey)
{
case "COMPANY":
$content = "方倍工作室提供互联网相关产品与服务。";
break;
default:
$content = "点击菜单：".$object->EventKey;
break;
}
break;
case "LOCATION":
$content = "上传位置：纬度 ".$object->Latitude.";经度 ".$object->Longitude;
break;
case "VIEW":
$content = "跳转链接 ".$object->EventKey;
break;
default:
$content = "receive a new event: ".$object->Event;
break;
}
$result = $this->transmitText($object, $content);
return $result;
}

//接收文本消息
private function receiveText($object)
{
switch ($object->Content)
{
case "文本":
$content = "这是个文本消息";
break;
case "图文":
case "单图文":
$content = array();
$content[] = array("Title"=>"单图文标题", "Description"=>"单图文内容", "PicUrl"=>"http://discuz.comli.com/weixin/weather/icon/cartoon.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
break;
case "多图文":
$content = array();
$content[] = array("Title"=>"多图文1标题", "Description"=>"", "PicUrl"=>"http://discuz.comli.com/weixin/weather/icon/cartoon.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
$content[] = array("Title"=>"多图文2标题", "Description"=>"", "PicUrl"=>"http://d.hiphotos.bdimg.com/wisegame/pic/item/f3529822720e0cf3ac9f1ada0846f21fbe09aaa3.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
$content[] = array("Title"=>"多图文3标题", "Description"=>"", "PicUrl"=>"http://g.hiphotos.bdimg.com/wisegame/pic/item/18cb0a46f21fbe090d338acc6a600c338644adfd.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
break;
case "音乐":
$content = array("Title"=>"最炫民族风", "Description"=>"歌手：凤凰传奇", "MusicUrl"=>"http://121.199.4.61/music/zxmzf.mp3", "HQMusicUrl"=>"http://121.199.4.61/music/zxmzf.mp3");
break;
default:
$content = date("Y-m-d H:i:s",time());
break;
}
if(is_array($content)){
if (isset($content[0]['PicUrl'])){
$result = $this->transmitNews($object, $content);
}else if (isset($content['MusicUrl'])){
$result = $this->transmitMusic($object, $content);
}
}else{
$result = $this->transmitText($object, $content);
}
return $result;
}

private function receiveImage($object)
{
$content = array("MediaId"=>$object->MediaId);
$result = $this->transmitImage($object, $content);
return $result;
}

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

private function receiveVoice($object)
{
if (isset($object->Recognition) && !empty($object->Recognition)){
$content = "你刚才说的是：".$object->Recognition;
$result = $this->transmitText($object, $content);
}else{
$content = array("MediaId"=>$object->MediaId);
$result = $this->transmitVoice($object, $content);
}

return $result;
}

private function receiveVideo($object)
{
$content = array("MediaId"=>$object->MediaId, "ThumbMediaId"=>$object->ThumbMediaId, "Title"=>"", "Description"=>"");
$result = $this->transmitVideo($object, $content);
return $result;
}

private function receiveLink($object)
{
$content = "你发送的是链接，标题为：".$object->Title."；内容为：".$object->Description."；链接地址为：".$object->Url;
$result = $this->transmitText($object, $content);
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 transmitImage($object, $imageArray)
{
$itemTpl = "<Image>
<MediaId><![CDATA[%s]]></MediaId>
</Image>";

$item_str = sprintf($itemTpl, $imageArray['MediaId']);

$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[image]]></MsgType>
$item_str
</xml>";

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

private function transmitVoice($object, $voiceArray)
{
$itemTpl = "<Voice>
<MediaId><![CDATA[%s]]></MediaId>
</Voice>";

$item_str = sprintf($itemTpl, $voiceArray['MediaId']);

$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[voice]]></MsgType>
$item_str
</xml>";

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

private function transmitVideo($object, $videoArray)
{
$itemTpl = "<Video>
<MediaId><![CDATA[%s]]></MediaId>
<ThumbMediaId><![CDATA[%s]]></ThumbMediaId>
<Title><![CDATA[%s]]></Title>
<Description><![CDATA[%s]]></Description>
</Video>";

$item_str = sprintf($itemTpl, $videoArray['MediaId'], $videoArray['ThumbMediaId'], $videoArray['Title'], $videoArray['Description']);

$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[video]]></MsgType>
$item_str
</xml>";

$result = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time());
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]]></Description>
<MusicUrl><![CDATA[%s]]></MusicUrl>
<HQMusicUrl><![CDATA[%s]]></HQMusicUrl>
</Music>";

$item_str = sprintf($itemTpl, $musicArray['Title'], $musicArray['Description'], $musicArray['MusicUrl'], $musicArray['HQMusicUrl']);

$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[music]]></MsgType>
$item_str
</xml>";

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

private function logger($log_content)
{
if(isset($_SERVER['HTTP_APPNAME'])){ //SAE
sae_set_display_errors(false);
sae_debug($log_content);
sae_set_display_errors(true);
}else if($_SERVER['REMOTE_ADDR'] != "127.0.0.1"){ //LOCAL
$max_size = 10000;
$log_filename = "log.xml";
if(file_exists($log_filename) and (abs(filesize($log_filename)) > $max_size)){unlink($log_filename);}
file_put_contents($log_filename, date('H:i:s')." ".$log_content."\r\n", FILE_APPEND);
}
}
}
?>