微信公众平台百度天气预报开发

1.登录百度ak申请: http://lbsyun.baidu.com/apiconsole/key

2.实现天气信息功能

baiduWeather.php

<?php
/**
 *  使用百度天气预报接口获取城市天气信息案例实现
 */

    //获取城市天气信息
    function getWeatherInfo($cityName){
        if($cityName == "" || (strstr($cityName,"+"))){
            return "发送城市加天气,例如北京天气";
        }
        //获取到的ak
        $ak = your ak;
        //获取到的sk
        $sk = your sk;
        //调用接口
        $url = 'http://api.map.baidu.com/telematics/v3/weather?ak=%s&location=%s&output=%s&sk=%s';
        $uri = '/telematics/v3/weather';

        $location = $cityName;
        $output = 'json';
        $querystring_arrays = array(
            'ak' => $ak,
            'location' => $location,
            'output' => $output
        );

        $querystring = http_build_query($querystring_arrays);
       //生成sn
        $sn = md5(urlencode($uri.'?'.$querystring.$sk));
        $targetUrl = sprintf($url,$ak,urlencode($location),$output,$sn);

        $ch = curl_init();
        curl_setopt($ch,CURLOPT_URL,$targetUrl);
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
        $result = curl_exec($ch);
        curl_close($ch);
        $result = json_decode($result,true);

        if($result["error"]!=0){
            return $result["status"];
        }

        $curHour = (int)date('H',time());
        $weather = $result["results"][0];
        $weatherArray[]=array("Title"=>$weather['currentCity']."天气预报","Description"=>"","PicUrl"=>"","Url"=>"");
        for($i = 0;$i<count($weather["weather_data"]);$i++){
            $weatherArray[] = array("Title"=>
                $weather["weather_data"][$i]["date"]."\n".
                $weather["weather_data"][$i]["weather"].
                $weather["weather_data"][$i]["wind"].
                $weather["weather_data"][$i]["temperature"],
                "Description"=>"",
                "PicUrl"=>(($curHour>=6)&&($curHour<
                18))?$weather["weather_data"][$i]["dayPictureUrl"]:$weather["weather_data"][$i]["nightPictureUrl"],"URL"=>""
            );
        }
        return $weatherArray;
    }

3.实现天气消息事件

<?php
/*
    CopyRight 2016 All Rights Reserved
*/

define("TOKEN", "weixin");
/**
 * 百度天气预报案例实现
 * 实现思路:
 * 1.申请百度ak、sk
 * 2.使用百度天气预报接口
 * 3.实现天气信息功能
 * 4.实现事件响应功能
 */
$wechatObj = new wechatCallbackapiTest();
if (!isset($_GET['echostr'])) {
    $wechatObj->responseMsg();
}else{
    $wechatObj->valid();
}

class wechatCallbackapiTest
{
    //验证签名
    public function valid()
    {
        $echoStr = $_GET["echostr"];
        if($this->checkSignature()){
			header('content-type:text');
            echo $echoStr;
            exit;
        }
    }

    public function checkSignature(){
        $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) {
            return true;
        }else{
            return false;
        }
    }

    //响应消息
    public function responseMsg()
    {
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        if (!empty($postStr)){
            $this->logger("R ".$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;
                default:
                    $result = "unknown msg type: ".$RX_TYPE;
                    break;
            }
            echo $result;
        }else {
            echo "";
            exit;
        }
    }

    //接收事件消息
    public function receiveEvent($object)
    {
        $content = "";
        switch ($object->Event)
        {
            case "subscribe":
                $content = "欢迎关注Nicky的公众号 ";
                $content .= (!empty($object->EventKey))?("\n来自二维码场景 ".str_replace("qrscene_","",$object->EventKey)):"";
                break;
            case "unsubscribe":
                $content = "取消关注";
                break;
        }
        $result = $this->transmitText($object, $content);
        return $result;
    }

    //接收文本消息
    public function receiveText($object)
    {
        $keyword = trim($object->Content);

        //自动回复模式

        if (strstr($keyword, "天气")){
            $city = str_replace('天气','',$keyword);
            include("baiduweather.php");
            $content = getWeatherInfo($city);
        }
        $result = $this->transmitNews($object, $content);
        return $result;
    }

    //回复图文消息
    public 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;
    }


    //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 = 10000;
            $log_filename = "log.xml";
            if(file_exists($log_filename) and (abs(filesize($log_filename)) > $max_size)){unlink($log_filename);}
            file_put_contents($log_filename, date('H:i:s')." ".$log_content."\r\n", FILE_APPEND);
        }
    }

}
?>

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