PHP实例：微信公众平台开发实现2048游戏的方法

<?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
{
 //验证签名
 public function valid()
 {
  $echoStr = $_GET["echostr"];
  $signature = $_GET["signature"];
  $timestamp = $_GET["timestamp"];
  $nonce = $_GET["nonce"];
  $token = TOKEN;
  $tmpArr = array($token, $timestamp, $nonce);
  sort($tmpArr);
  $tmpStr = implode($tmpArr);
  $tmpStr = sha1($tmpStr);
  if($tmpStr == $signature){
   echo $echoStr;
   exit;
  }
 }
 //响应消息
 public function responseMsg()
 {
  $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
  if (!empty($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;
   }
   echo $result;
  }else {
   echo "";
   exit;
  }
 }
 //接收事件消息
 private function receiveEvent($object)
 {
  $content = "";
  switch ($object->Event)
  {
   case "subscribe":
    $content = "欢迎关注方倍工作室\n回复 2048 开始游戏";
    break;
  }
  if(is_array($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 (strstr($keyword, "2048")){
   $content = array();
   $content[] = array("Title"=>"2048游戏", "Description"=>"游戏规则很简单,每次可以选择上下左右其中一个方向去滑动,每滑动一次,所有的数字方块都会往滑动的方向靠拢外,系统也会在空白的地方乱数出现一个数字方块,相同数字的方块在靠拢、相撞时会相加.系统给予的数字方块不是2就是4,玩家要想方法在这小小的16格范围中凑出“2048”这个数字方块.", "PicUrl"=>"http://img.laohu.com/www/201403/27/1395908994962.png", "Url" =>"http://gabrielecirulli.github.io/2048/");
  }else{
   $content = date("Y-m-d H:i:s",time())."\n技术支持 方倍工作室";
  }
  
  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, $content);
  }
 }
 //回复文本消息
 private function transmitText($object, $content)
 {
  $xmlTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[%s]]></Content>
</xml>";
  $result = sprintf($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>
  <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']);
  }
  $xmlTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[news]]></MsgType>
<ArticleCount>%s</ArticleCount>
<Articles>
$item_str</Articles>
</xml>";
  $result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, time(), count($newsArray));
  return $result;
 }
}
?>