PHP implements WeChat real-time weather query-PHP Tutorial-php.cn

When we develop WeChat applications such as WeChat public accounts, we all hope that the more functions the better, so today we will talk about how to implement WeChat weather query with PHP. It is actually not too complicated. You only need to call Baidu. The weather interface is enough. Without further ado, let’s take a look!

The effect we want to achieve is as shown in the figure below. When you enter the weather of a certain place such as "Shenzhen Weather" in WeChat, the following page will appear:

PHP implements WeChat real-time weather query ##ps :
Let me state here that the backend server I use is Sina sae server. I won’t introduce too much here.

The first page code

This One page of code is mainly used for token verification and responding to WeChat user requests through the backend server. The code on this page is relatively simple and will not be introduced.

<?php
header("content-Type:text;charset=utf8;")
define("TOKEN", "weixin");

$wechatObj = new wechatCallbackapiTest();
if (!isset($_GET[&#39;echostr&#39;])) {
    $wechatObj->responseMsg();
}else{
    $wechatObj->valid();
}

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);
        $tmpStr = implode($tmpArr);
        $tmpStr = sha1($tmpStr);

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

    public function responseMsg()
    {
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        if (!empty($postStr)){
            $this->logger("R ".$postStr);
            $postObj = simplexml_load_string($postStr, &#39;SimpleXMLElement&#39;, LIBXML_NOCDATA);
            $RX_TYPE = trim($postObj->MsgType);

            switch ($RX_TYPE)
            {
                case "event":
                    $result = $this->receiveEvent($postObj);
                    break;
                case "text":
                    $result = $this->receiveText($postObj);
                    break;
            }
            $this->logger("T ".$result);
            echo $result;
        }else {
            echo "";
            exit;
        }
    }

    private function receiveEvent($object)
    {
        $content = "";
        switch ($object->Event)
        {
            case "subscribe":
                $content = "欢迎关注，查询天气，发送天气加城市名，如“深圳天气”";
                break;
            case "unsubscribe":
                $content = "取消关注";
                break;
        }
        $result = $this->transmitText($object, $content);
        return $result;
    }
  //str_replace（str1,str2,str3）用str3包含str1，用str2取代str1.
    private function receiveText($object)
    {
        $keyword = trim($object->Content);
        if (strstr($keyword, "天气")){
            $city = str_replace(&#39;天气&#39;, &#39;&#39;, $keyword);//这里用空格取代$keyword中的天气二字。
            include("weather2.php");
            $content = getWeatherInfo($city);
        //判断笑话
        }
        $result = $this->transmitNews($object, $content);
        return $result;
    }


    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);
        return $result;
    }

    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[&#39;Title&#39;], $item[&#39;Description&#39;], $item[&#39;PicUrl&#39;], $item[&#39;Url&#39;]);

        $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;
    }

    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[&#39;Title&#39;], $musicArray[&#39;Description&#39;], $musicArray[&#39;MusicUrl&#39;], $musicArray[&#39;HQMusicUrl&#39;]);

        $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 $result;
    }
    //这里主要用于在服务器端生成日志
    private function logger($log_content)
    {
        if(isset($_SERVER[&#39;HTTP_BAE_ENV_APPID&#39;])){   //BAE
            require_once "BaeLog.class.php";
            $logger = BaeLog::getInstance();
            $logger ->logDebug($log_content);
        }else if(isset($_SERVER[&#39;HTTP_APPNAME&#39;])){   //SAE
            sae_set_display_errors(false);
            sae_debug($log_content);
            sae_set_display_errors(true);
        }else if($_SERVER[&#39;REMOTE_ADDR&#39;] != "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($log_filename, date(&#39;H:i:s&#39;)." ".$log_content."\r\n", FILE_APPEND);
        }
    }
}


?>

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The second page of code

This page of code is mainly about the process of calling Baidu weather interface and their data transmission method.

1. If we want to call Baidu's weather interface, we need to register on the Baidu Map Open Platform, and then create an application to obtain the ak and sk of the application.

PHP implements WeChat real-time weather query After obtaining ak (i.e. access key), click Settings, the page is as follows:

Select the sn verification method where the verification method is requested, it will automatically The sk code (ie Security Key) below appears.

For the specific role of sk and the sn calculation algorithm, please refer to the following article

http://lbsyun.baidu.com/index.php?title=lbscloud/api/appendix

<?php

// var_dump(getWeatherInfo("桃江"));
getWeatherInfo("深圳");
function getWeatherInfo($cityName)
{
    if ($cityName == "" || (strstr($cityName, "+"))){
        return "发送天气加城市，例如&#39;天气深圳&#39;";
    }

    $ak = &#39;Plev804CmHUMwPXVcehCcB14Ths0zuat&#39;;//从百度地图开发平台获取的ak
    $sk = &#39;Iv3vSPCd2jnIlMlCrCgywGSkP9PaXiDC&#39;;//从百度地图开发平台获取的sk

//向百度地图开发平台请其数据的url如http://api.map.baidu.com/geocoder/v2/?address=百度大厦&output=json&ak=yourak**&sn=7de5a22212ffaa9e326444c75a58f9a0。包含4个参数，address（查询地址），output（请求数据的恢复格式）、ak(验证密钥)、sn是经过加密后的数据。

    $url = &#39;http://api.map.baidu.com/telematics/v3/weather?ak=%s&location=%s&output=%s&sn=%s&#39;;
    $uri = &#39;/telematics/v3/weather&#39;;
    $location = $cityName;
    $output = &#39;json&#39;;
    $querystring_arrays = array(
        &#39;ak&#39; => $ak,
        &#39;location&#39; => $location,
        &#39;output&#39; => $output
    );
    $querystring = http_build_query($querystring_arrays);//使用关联数组生成一个urlencode请求字符串。格式如下：ak=Plev804CmHUMwPXVcehCcB14Ths0zuat&location=深圳&output=json；
   // var_dump($querystring);
//urlencode（）   url中的一些特殊字符和中文字符可能不被服务器所识别，需要经过urlencode（）编码才能被识别。
    $sn = md5(urlencode($uri.&#39;?&#39;.$querystring.$sk));//md5（）对url中的数据进行加密。
    $targetUrl = sprintf($url, $ak, urlencode($location), $output, $sn);
    // var_dump($targetUrl);

//curl用于与接口服务器建立会话获取 接口传递过来的数据。
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $targetUrl);//与接口简历会话
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);//获取的数据存储在一个变量上，而不是直接输出。如果为o或false则直接输出。
    $result = curl_exec($ch);//执行会话，获取数据。
    echo $result;//字符串格式加数个json格式的数据类型
    curl_close($ch);
    $result = json_decode($result, true);//参数带true返回一个数组
    echo "</br>";
     echo "</br>";
      echo "</br>";
       echo "</br>";

        echo "</br>";
         echo "</br>";
          echo "</br>";
           echo "</br>";
    var_dump($result);
    if ($result["error"] != 0){
        return $result["status"];
    }
    $curHour = (int)date(&#39;H&#39;,time());
     echo "</br>";
         echo "</br>";
          echo "</br>";
           echo "</br>";
    echo $curHour;
    $weather = $result["results"][0];
    $weatherArray[] = array("Title" =>$weather[&#39;currentCity&#39;]."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;
}


?>

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The above is all the content of this article. Please take a good look at it. This article may be a bit difficult for students who have just started to contact WeChat development!

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