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WeChat interface class

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Release: 2016-08-22 10:13:32
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valid();
//开启自动回复功能
$wechatObj->responseMsg();


//定义类文件
class wechatCallbackapiTest
{
    //实现valid验证方法:实现对接微信公众平台
	public function valid()
    {
        //接受随机字符串
        $echoStr = $_GET["echostr"];

        //valid signature , option
        //进行用户数字签名验证
        if($this->checkSignature()){
            //如果成功,则返回接受到的随机字符串
        	echo $echoStr;
            //退出
        	exit;
        }
    }
    //定义自动回复功能
    public function responseMsg()
    {
		//get post data, May be due to the different environments
        //接受用户端发送过来的xml数据
		$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

      	//extract post data
        //判断xml数据是否为空
		if (!empty($postStr)){
                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
                   the best way is to check the validity of xml by yourself */
                libxml_disable_entity_loader(true);
                //通过simplexml进行xml解析
              	$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                //接受微信的手机端
                $fromUsername = $postObj->FromUserName;
                //微信公众平台
                $toUsername = $postObj->ToUserName;
                //接受用户发送的关键词
                $keyword = trim($postObj->Content);
                //1.接受用户消息类型
                $msgType = $postObj -> MsgType;
                //时间戳
                $time = time();
                //文本发送模板
                $textTpl = "%s0"; 
                //////////////////////////////////////////////////////////////////////////////////
                //如果用户发送的是文本类型文件,执行以下
                if($msgType == 'text'){
                    if(!empty( $keyword ))
                    {
                        /*这是一个实例
                            //如果发送文本信息
                            $msgType = "text";
                            //回复内容
                            if($keyword == "李楠"){
                                $contentStr = "叫我干嘛";
                            }else{
                                $contentStr = "叫我干嘛";
                            }
                            //格式化xml模板,参数与上面的模板是一一对应的.fromUsername和头Username是相反的,只写带%s的
                            $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);

                            //将xml信息返回给客户端
                            echo $resultStr;
                        */
                       if($keyword == "?" || $keyword == "?"){
                            $msgType = "text";
                            $contentStr = "1.特种服务号码\n2.通讯服务号码";
                            $resultStr = sprintf($textTpl,$fromUsername,$toUsername,$time,$msgType,$contentStr);
                            echo $resultStr;
                       }elseif($keyword == 1){
                            $msgType = "text";
                            $contentStr = "1.匪警:110\n2.火警:119\n3.急救:120";
                            $resultStr = sprintf($textTpl,$fromUsername,$toUsername,$time,$msgType,$contentStr);
                            echo $resultStr;
                       }elseif($keyword == 2){
                            $msgType = "text";
                            $contentStr = "1.中国移动:10086\n2.中国联通:10010";
                            $resultStr = sprintf($textTpl,$fromUsername,$toUsername,$time,$msgType,$contentStr);
                            echo $resultStr;
                       }
                    }else{
                        echo "不能不说话";
                    }
                }
                ////////////////////////////////////////////////////////////////////////////////////
                //接受图片信息
                if($msgType == "image"){
                        //如果发送文本信息
                        $msgType = "text";
                        //回复内容
                        $contentStr = "你发送的是图片文件";
                        //格式化字符串
                        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                        //将xml信息返回给客户端
                        echo $resultStr;
                }
                ////////////////////////////////////////////////////////////////////////////////////
                if($msgType == "voice"){
                        //如果发送文本信息
                        $msgType = "text";
                        //回复内容
                        $contentStr = "你发送的是语音文件";
                        //格式化字符串
                        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                        //将xml信息返回给客户端
                        echo $resultStr;
                }
                ////////////////////////////////////////////////////////////////////////////////////
                if($msgType == "video"){
                        //如果发送文本信息
                        $msgType = "text";
                        //回复内容
                        $contentStr = "你发送的是视频文件";
                        //格式化字符串
                        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                        //将xml信息返回给客户端
                        echo $resultStr;
                }
                ////////////////////////////////////////////////////////////////////////////////////
                if($msgType == "shortvideo"){
                        //如果发送文本信息
                        $msgType = "text";
                        //回复内容
                        $contentStr = "你发送的是小视频文件";
                        //格式化字符串
                        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                        //将xml信息返回给客户端
                        echo $resultStr;
                }
                ////////////////////////////////////////////////////////////////////////////////////
                if($msgType == "location"){
                        //如果发送文本信息
                        $msgType = "text";
                        //回复内容
                        $contentStr = "你发送的是地理位置文件";
                        //格式化字符串
                        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                        //将xml信息返回给客户端
                        echo $resultStr;
                }
                ////////////////////////////////////////////////////////////////////////////////////
                if($msgType == "link"){
                        //如果发送文本信息
                        $msgType = "text";
                        //回复内容
                        $contentStr = "你发送的是连接文件";
                        //格式化字符串
                        $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                        //将xml信息返回给客户端
                        echo $resultStr;
                }
                ////////////////////////////////////////////////////////////////////////////////////
                /*
                //判断用户发送关键词是否为空           
				
                if(!empty( $keyword ))
                {
                    //如果发送文本信息
              		$msgType = "text";
                    //回复内容
                	$contentStr = "大家好,我是hero";
                    //格式化字符串
                	$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                    //将xml信息返回给客户端
                	echo $resultStr;
                }else{
                	echo "Input something...";
                }
                */
        }else {
        	echo "";
        	exit;
        }
    }
		
	private function checkSignature()
	{
        // you must define TOKEN by yourself
        //判断是否定义了TOKEN,如果没有就抛出一个异常
        if (!defined("TOKEN")) {
            throw new Exception('TOKEN is not defined!');
        }
        
        $signature = $_GET["signature"];//接受微信加密签名
        $timestamp = $_GET["timestamp"];//接受时间戳
        $nonce = $_GET["nonce"];//接受随机数
        		
		$token = TOKEN;//把TOKEN常量赋值给$token
        //把相关参数组装成数组
		$tmpArr = array($token, $timestamp, $nonce);
        // use SORT_STRING rule
        //排序
		sort($tmpArr, SORT_STRING);
        //把排序后的数组转换成字符串
		$tmpStr = implode( $tmpArr );
        //通过哈希算法加密
		$tmpStr = sha1( $tmpStr );
		//与加密签名进行对比
		if( $tmpStr == $signature ){
            //相同返回true
			return true;
		}else{
            //不同返回false
			return false;
		}
	}
}

?>
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