php微信公众平台交互与接口详解

例如：url为http://weixinceshi111111.applinzi.com/index2.php
token：weixin
index2.php代码

<?php
//
// 响应用户消息
// 微信公众账号响应给用户的不同消息类型
//微信服务器要和后台服务器进行通信首先要进行token验证，微信会通过get方式发送signature（微信加密签名）、nonce（随机数）、timestamp（时间戳）、echostr（随机字符串）。后台服务器获取之后会将timestamp、nonce与自身定义的TOKEN按照一定的顺序拼接成字符串，通过shal加密后获得的结果与signature进行对比，如果相同则把echostr返回给微信服务器。 表示验证成功。
header("content-type:text;charset=utf8");
define("TOKEN", "weixin");
//token验证是通过get传输数据，微信用户发送的数据通过post方式发送。先进行get请求，再进行post请求。
$wechatObj = new wechatCallbackapiTest();
//判断是get请求还是post请求。$_GET['echostr']如果存在，表示是进行token验证的get请求。反之是传输数据的post请求。
if (!isset($_GET['echostr'])) {
 $wechatObj->responseMsg();//响应数据
}else{
 $wechatObj->valid();//响应
}

class wechatCallbackapiTest
{
 public function valid()
 {
 $echoStr = $_GET["echostr"];
 if($this->checkSignature()){
 echo $echoStr;
 exit;
 }
 }

 private function checkSignature()
 {
 $signature = $_GET["signature"];
 $timestamp = $_GET["timestamp"];
 $nonce = $_GET["nonce"];
 $token = TOKEN;
 $tmpArr = array($token, $timestamp, $nonce);
 sort($tmpArr);//对数组中的元素进行排序
 $tmpStr = implode($tmpArr);//将数组中的元素连接成一个字符串
 $tmpStr = sha1($tmpStr);//对字符串进行加密操作。

 if($tmpStr == $signature){
 return true;
 }else{
 return false;
 }
 }

 public function responseMsg()
 {
 $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];//获取发送过来的数据。
 if (!empty($postStr)){
 $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', );//把xml字符串载入到一个SimpleXMLelement对象中。simplexml_load_string()是一种xml解析器。
 $RX_TYPE = trim($postObj->MsgType);//trim去掉字符串两端kongge。

 //用户发送的消息类型判断
 switch ($RX_TYPE)
 {
 case "text":
  $result = $this->receiveText($postObj);
  break;
 case "image":
  $result = $this->receiveImage($postObj);
  break;
 case "voice":
  $result = $this->receiveVoice($postObj);
  break;
 case "video":
  $result = $this->receiveVideo($postObj);
  break;
 default:
  $result = "unknow msg type: ".$RX_TYPE;
  break;
 }
 echo $result;
 }else {
 echo "";
 exit;
 }
 }

 private function receiveText($object)
 {
 $keyword = trim($object->Content);

 if($keyword == "文本"){
 //回复文本消息
 $content = "这是个文本消息";
 $result = $this->transmitText($object, $content);
 }
 else if($keyword == "图文" || $keyword == "单图文"){
 //回复单图文消息
 $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");
 $result = $this->transmitNews($object, $content);
 }
 else if($keyword == "多图文"){
 //回复多图文消息
 $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");
 $result = $this->transmitNews($object, $content);

 }
 else if($keyword == "音乐"){
 //回复音乐消息
 $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");
 $result = $this->transmitMusic($object, $content);
 }

 return $result;
 }

 private function receiveImage($object)
 {
 //回复图片消息 
 $content = array("MediaId"=>$object->MediaId);
 $result = $this->transmitImage($object, $content);;
 return $result;
 }

 private function receiveVoice($object)
 {
 //回复语音消息 
 $content = array("MediaId"=>$object->MediaId);
 $result = $this->transmitVoice($object, $content);;
 return $result;
 }

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

 /*
 * 回复文本消息，将要回复的xml消息进行包装。
 */
 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);//sprintf（）这个函数的作用还是比较有意思的，可以搜索看看。
 return $result;
 }

 /*
 * 回复图片消息
 */
 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;
 }

 /*
 * 回复语音消息
 */
 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;
 }

 /*
 * 回复视频消息
 */
 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;
 }

 /*
 * 回复图文消息
 */
 private function transmitNews($object, $arr_item)
 {
 if(!is_array($arr_item))
 return;

 $itemTpl = " <item>
 <Title><![CDATA[%s]]></Title>
 <Description><![CDATA[%s]]></Description>
 <PicUrl><![CDATA[%s]]></PicUrl>
 <Url><![CDATA[%s]]></Url>
 </item>
";
 $item_str = "";
 foreach ($arr_item 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, $object->ToUserName, time(), count($arr_item));
 return $result;
 }

 /*
 * 回复音乐消息
 */
 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;
 }
}
?>
								 
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