从微信官网下载示例代码，把下面代码覆盖demo.php即可，如有疑惑欢迎私密。

/*

椰子园 http://www.yeziyuan.com

email coconutgarden@sina.com

CopyRight 2014 All Rights Reserved

*/

define("TOKEN", "thisisyourselftoken");

define("AppID", "nowisyourappid");

define("EncodingAESKey", "hereisyourselfencodekay43bit");

require_once('wxBizMsgCrypt.php');

$wechatObj = new wechatCallbackapiTest();

if (!isset($_GET['echostr'])) {

$wechatObj->responseMsg();

}else{

$wechatObj->valid();

}

class wechatCallbackapiTest

{

//验证签名

public function valid()

{

$echoStr = $_GET["echostr"];

$signature = $_GET["signature"];

$timestamp = $_GET["timestamp"];

$nonce = $_GET["nonce"];

$tmpArr = array(TOKEN, $timestamp, $nonce);

sort($tmpArr);

$tmpStr = implode($tmpArr);

$tmpStr = sha1($tmpStr);

if($tmpStr == $signature){

echo $echoStr;

exit;

}

}

//响应消息

public function responseMsg()

{

$timestamp = $_GET['timestamp'];

$nonce = $_GET["nonce"];

$msg_signature = $_GET['msg_signature'];

$encrypt_type = (isset($_GET['encrypt_type']) && ($_GET['encrypt_type'] == 'aes')) ? "aes" : "raw";

$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

if (!empty($postStr)){

//解密

if ($encrypt_type == 'aes'){

$pc = new WXBizMsgCrypt(TOKEN, EncodingAESKey, AppID);

$this->logger(" D \r\n".$postStr);

$decryptMsg = ""; //解密后的明文

$errCode = $pc->DecryptMsg($msg_signature, $timestamp, $nonce, $postStr, $decryptMsg);

$postStr = $decryptMsg;

}

$this->logger(" R \r\n".$postStr);

$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);

$RX_TYPE = trim($postObj->MsgType);

//消息类型分离

switch ($RX_TYPE)

{

case "event":

$result = $this->receiveEvent($postObj);

break;

case "text":

$result = $this->receiveText($postObj);

break;

}

$this->logger(" R \r\n".$result);

//加密

if ($encrypt_type == 'aes'){

$encryptMsg = ''; //加密后的密文

$errCode = $pc->encryptMsg($result, $timeStamp, $nonce, $encryptMsg);

$result = $encryptMsg;

$this->logger(" E \r\n".$result);

}

echo $result;

}else {

echo "";

exit;

}

}

//接收事件消息

private function receiveEvent($object)

{

$content = "";

switch ($object->Event)

{

case "subscribe":

$content = "欢迎关注椰子园，官网http://www.yeziyuan.com ";

break;

}

$result = $this->transmitText($object, $content);

return $result;

}

//接收文本消息

private function receiveText($object)

{

$keyword = trim($object->Content);

if (strstr($keyword, "文本")){

$content = "这是个文本消息";

}else if (strstr($keyword, "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");

}else if (strstr($keyword, "图文") || strstr($keyword, "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");

}else if (strstr($keyword, "音乐")){

$content = array();

$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");

}else{

$content = date("Y-m-d H:i:s",time())."\n".$object->FromUserName."\n技术支持 椰子园";

}

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);

}

$content = "本服务号暂未开发，目前仅供活动测试用，感谢您长期以来对椰子园的支持。";

$result = $this->transmitText($object, $content);

return $result;

}

//回复文本消息

private function transmitText($object, $content)

{

$xmlTpl = "

%s

";

$result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, time(), $content);

return $result;

}

//回复图文消息

private function transmitNews($object, $newsArray)

{

if(!is_array($newsArray)){

return;

}

$itemTpl = "

";

$item_str = "";

foreach ($newsArray as $item){

$item_str .= sprintf($itemTpl, $item['Title'], $item['Description'], $item['PicUrl'], $item['Url']);

}

$xmlTpl = "

%s

%s

$item_str

";

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

return $result;

}

//回复音乐消息

private function transmitMusic($object, $musicArray)

{

$itemTpl = "

";

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

$xmlTpl = "

%s

$item_str

";

$result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, time());

return $result;

}

//日志记录

public 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 = 500000;

$log_filename = "log.xml";

if(file_exists($log_filename) and (abs(filesize($log_filename)) > $max_size)){unlink($log_filename);}

file_put_contents($log_filename, date('Y-m-d H:i:s').$log_content."\r\n", FILE_APPEND);

}

}

}

?>