微信公共平台开发

微信公共平台开发原理和步骤：

1. 搭建自己的服务器和域名绑定，并可以通过网络访问到该服务器

2. 申请称为微信公共平台开发者

3. 申请通过后开发自己的微信产品

原理：用户通过客户端发送的数据通过微信服务器的再包装，然后post到自己的服务器，自己的服务器处理这些数据后包装成xml格式的数据在post到微信服务器，这里微信服务器其实就是包装和中转了一下，然后返回给用户

案例：

<?php
//TOKEN 为申请微信开发者时自己制定的名字
define("TOKEN", "zangbc");
$wechatObj = new wechatCallbackapiTest();
if (isset($_GET['echostr'])) {
    $wechatObj->valid();
}else{
    $wechatObj->responseMsg();
}

class wechatCallbackapiTest
{
	//如果合法则返回签名串给微信服务器
	public function valid()
    {
        $echoStr = $_GET["echostr"];
        if($this->checkSignature()){
        	echo $echoStr;
        	exit;
        }
    }
	//通过一个签名串来检测该开发者是否合法
	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;
		}
	}
	//通过用户输入的关键字来判断返回相应的数据
    public function responseMsg()
    {
		$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
		if (!empty($postStr)){
                
              	$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
				if(!empty( $keyword ))
                {
					if( $keyword=="星座")
					{
						$textTpl=$this->setResponseXml("星座查询方式：
回复： 生日日日期 如 【1999.1.1】");
						$msgType = "text";
						$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType);
						echo $resultStr;
					}else if(count(explode('.',$keyword))==3){
						$keyword1 = explode('.',$keyword);
						$textTpl=$this->getTextTpl_XinZuo($keyword1);
						$msgType = "text";
						$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType);
						echo $resultStr;
					}else if(mb_substr($keyword,2,2,"utf-8")=="天气"){
						$textTpl=$this->getTextTpl_Weather($keyword);
                        //$msgType = "text";
						$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time);
						echo $resultStr;
					}else if($keyword=="野树林"){
						$textTpl=$this->setResponseXml("#野树林工作室#
【1】星座查询,回复【星座】
【2】天气查询，回复【城市名+天气】如 杨凌天气
【3】歌曲欣赏，回复【歌曲+歌曲名】如 歌曲时间都去哪儿了");
						$msgType = "text";
						$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType);
						echo $resultStr;
					}else if(mb_substr($keyword,0,2,"utf-8")=="歌曲"){
                        //$textTpl=$this->setResponseXml();
                        $textTpl=$this->getTextTpl_Songs($keyword);
						$msgType = "music";
						$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType);
						echo $resultStr;
                    }else{
						$textTpl=$this->setResponseXml("我还在成长中哦~
更多功能请回复【野树林】");
						$msgType = "text";
						$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType);
						echo $resultStr;
					}
                }else{
                	echo "Input something...";
                }

        }else {
        	echo "";
        	exit;
        }
    }
    //返回格式为音乐的xml
    private function setResponseXmlMusic($songObj)
    {
		if(@$songObj['music']!=null)
		{
			 $textTpl = "<xml>
							<ToUserName><![CDATA[%s]]></ToUserName>
							 <FromUserName><![CDATA[%s]]></FromUserName>
							 <CreateTime>%s</CreateTime>
							 <MsgType><![CDATA[%s]]></MsgType>
								<Music>
									<Title><![CDATA[".$songObj['music']['title']."]]></Title>
									<Description><![CDATA[]]></Description>
									<MusicUrl><![CDATA[".$songObj['music']['musicurl']."]]></MusicUrl>
									<HQMusicUrl><![CDATA[".$songObj['music']['hqmusicurl']."]]></HQMusicUrl>
								</Music>

							 <FuncFlag>0</FuncFlag>
						</xml>";
		}else{
			$textTpl = "<xml>
							<ToUserName><![CDATA[%s]]></ToUserName>
							 <FromUserName><![CDATA[%s]]></FromUserName>
							 <CreateTime>%s</CreateTime>
							 <MsgType><![CDATA[%s]]></MsgType>
								<Music>
									<Title><![CDATA[时间都去哪儿了]]></Title>
									<Description><![CDATA[]]></Description>
									<MusicUrl><![CDATA[http://play.baidu.com/?__m=mboxCtrl.playSong&__a=14385500&__o=/song/14385500||playBtn&fr=altg3||www.baidu.com#loaded]]></MusicUrl>
									<HQMusicUrl><![CDATA[http://play.baidu.com/?__m=mboxCtrl.playSong&__a=14385500&__o=/song/14385500||playBtn&fr=altg3||www.baidu.com#loaded]]></HQMusicUrl>
								</Music>

							 <FuncFlag>0</FuncFlag>
						</xml>";
		}
        return  $textTpl;
    }
    //用来获取网络中的音乐资源
    private function getTextTpl_Songs($keyword)
    {
    	$songname=mb_substr($keyword,2,strlen($keyword),"utf-8");
        $url="http://api2.sinaapp.com/search/music/?appkey=0020130430&appsecert=fa6095e1133d28ad&reqtype=music&keyword=".urlencode($songname);
        $song=file_get_contents($url);
        $songObj = json_decode($song, true);//转为json格式数据
        $textTpl=$this->setResponseXmlMusic($songObj);
        return $textTpl;
    }
    //返回从自己服务器端文件中获取到的星座信息
    private function getXinZuo($filepath)
	{
		return file_get_contents($filepath);
	}
    //获取12个星座所对应的xml格式数据
	private function getTextTpl_XinZuo($keyword)
	{
		if(count($keyword)==3)
		{
			switch($keyword[1])
			{
				case 1:
					if($keyword[2]>=1&&$keyword[2]<=19)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/MoXie.txt"));
					}else if($keyword[2]>=20&&$keyword[2]<=31)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ShuiPing.txt"));
					}
					break;
				case 2:
					if($keyword[2]>=1&&$keyword[2]<=18)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ShuiPing.txt"));
					}else if($keyword[1]>=19&&$keyword[1]<=28)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ShuangYu.txt"));
					}
					break;
				case 3:
					if($keyword[2]>=1&&$keyword[2]<=20)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ShuangYu.txt"));
					}else if($keyword[1]>=21&&$keyword[1]<=31)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/BaiYang.txt"));
					}
					break;
				case 4:
					if($keyword[2]>=1&&$keyword[2]<=19)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/BaiYang.txt"));
					}else if($keyword[1]>=20&&$keyword[1]<=30)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/JinNiu.txt"));
					}
					break;
				case 5:
					if($keyword[2]>=1&&$keyword[2]<=20)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/JinNiu.txt"));
					}else if($keyword[1]>=21&&$keyword[1]<=31)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ShuangZi.txt"));
					}
					break;
				case 6:
					if($keyword[2]>=1&&$keyword[2]<=21)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ShuangZi.txt"));
					}else if($keyword[2]>=22&&$keyword[2]<=30)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/JuXie.txt"));
					}
					break;
				case 7:
					if($keyword[2]>=1&&$keyword[2]<=22)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/JuXie.txt"));
					}else if($keyword[1]>=23&&$keyword[1]<=31)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ShiZi.txt"));
					}
					break;
				case 8:
					if($keyword[2]>=1&&$keyword[2]<=22)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ShiZi.txt"));
					}else if($keyword[1]>=23&&$keyword[1]<=31)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ChuNv.txt"));
					}
					break;
				case 9:
					if($keyword[2]>=1&&$keyword[2]<=22)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/ChuNv.txt"));
					}else if($keyword[1]>=23&&$keyword[1]<=30)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/TianPing.txt"));
					}
					break;
				case 10:
					if($keyword[2]>=1&&$keyword[2]<=23)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/TianPing.txt"));
					}else if($keyword[1]>=24&&$keyword[1]<=31)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/TianXie.txt"));
					}
					break;
				case 11:
					if($keyword[2]>=1&&$keyword[2]<=22)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/TianXie.txt"));
					}else if($keyword[1]>=23&&$keyword[1]<=30)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/SheShou.txt"));
					}
					break;
				case 12:
					if($keyword[2]>=1&&$keyword[2]<=21)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/SheShou.txt"));
					}else if($keyword[1]>=22&&$keyword[1]<=31)
					{
						$textTpl=$this->setResponseXml($this->getXinZuo("XinZuo/MoXie.txt"));
					}
					break;
				default:
					$textTpl="~~o(>_<)o ~~
亲，你输入的生日有误幺!
正确输入格式如下[2014.1.1]";
					break;
			}
		}else{
			$textTpl=$this->setResponseXml("~~o(>_<)o ~~
亲，你输入的生日有误幺!
正确输入格式如下[2014.1.1]");
		}
		return $textTpl;
	}
	//获取网络中的天气资源
	private function getTextTpl_Weather($keyword)
	{
        $cityname=trim(mb_substr($keyword,0,2,"utf-8"));
		$url = "http://api.map.baidu.com/telematics/v3/weather?location=".urlencode($cityname)."&output=json&ak=5slgyqGDENN7Sy7pw29IUvrZ";
		$weatherJson = file_get_contents($url);
		$weather = json_decode($weatherJson, true);
		$textTpl=$this->setResponseXmlWeather($weather);
		return $textTpl;	
	}
	//设置天气返回的图文格式xml数据
    private function setResponseXmlWeather($weather)
	{
		if(@$weather['results']!=null)
		{
			$textTpl="<xml>
					<ToUserName><![CDATA[%s]]></ToUserName>
					<FromUserName><![CDATA[%s]]></FromUserName>
					<CreateTime>%s</CreateTime>
					<MsgType><![CDATA[news]]></MsgType>
					<Content><![CDATA[]]></Content>
					<ArticleCount>4</ArticleCount>
					<Articles>
						<item>
							<Title><![CDATA[【".$weather['results'][0]['currentCity']."】天气预报  ".$weather['results'][0]['weather_data'][0]['date']." ".$weather['results'][0]['weather_data'][0]['weather']." ".$weather['results'][0]['weather_data'][0]['wind']." ".$weather['results'][0]['weather_data'][0]['temperature']."]]></Title>
							<Description><![CDATA[白天]]></Description>
							<PicUrl><![CDATA[http://t11.baidu.com/it/u=3787200454,2899262770&fm=90&gp=0.jpg]]></PicUrl>
							<Url><![CDATA[]]></Url>
						</item>
						<item>
							<Title><![CDATA[".$weather['results'][0]['weather_data'][1]['date']." ".$weather['results'][0]['weather_data'][1]['weather']." ".$weather['results'][0]['weather_data'][1]['wind']." ".$weather['results'][0]['weather_data'][1]['temperature']."]]></Title>
							<Description><![CDATA[白天]]></Description>
							<PicUrl><![CDATA[".$weather['results'][0]['weather_data'][1]['dayPictureUrl']."]]></PicUrl>
							<Url><![CDATA[]]></Url>
						</item>
						<item>
							<Title><![CDATA[".$weather['results'][0]['weather_data'][2]['date']." ".$weather['results'][0]['weather_data'][2]['weather']." ".$weather['results'][0]['weather_data'][2]['wind']." ".$weather['results'][0]['weather_data'][2]['temperature']."]]></Title>
							<Description><![CDATA[白天]]></Description>
							<PicUrl><![CDATA[".$weather['results'][0]['weather_data'][2]['dayPictureUrl']."]]></PicUrl>
							<Url><![CDATA[]]></Url>
						</item>
						<item>
							<Title><![CDATA[".$weather['results'][0]['weather_data'][3]['date']." ".$weather['results'][0]['weather_data'][3]['weather']." ".$weather['results'][0]['weather_data'][3]['wind']." ".$weather['results'][0]['weather_data'][3]['temperature']."]]></Title>
							<Description><![CDATA[白天]]></Description>
							<PicUrl><![CDATA[".$weather['results'][0]['weather_data'][3]['dayPictureUrl']."]]></PicUrl>
							<Url><![CDATA[]]></Url>
						</item>
					</Articles>
					<FuncFlag>0</FuncFlag>
				</xml>";
		}else{
			$textTpl="<xml>
						<ToUserName><![CDATA[%s]]></ToUserName>
						<FromUserName><![CDATA[%s]]></FromUserName>
						<CreateTime>%s</CreateTime>
						<MsgType><![CDATA[text]]></MsgType>
						<Content><![CDATA[~~o(>_<)o ~~抱歉，暂无次城市天气实况]]></Content>
						<FuncFlag>0</FuncFlag>
					</xml>";
		}
		return $textTpl;
	}
    //设置普通文本的xml格式数据
	private function setResponseXml($stringXml)
	{
		$stringXml="<xml>
						<ToUserName><![CDATA[%s]]></ToUserName>
						<FromUserName><![CDATA[%s]]></FromUserName>
						<CreateTime>%s</CreateTime>
						<MsgType><![CDATA[%s]]></MsgType>
						<Content><![CDATA[".$stringXml."]]></Content>
						<FuncFlag>0</FuncFlag>
					</xml>";
		return $stringXml;
	}
}
?>