微信公众平台开发入门：[7]开发天气预报功能

在这篇教程中，我们将介绍如何在微信公众平台上开发天气预报功能。我们将使用中国天气网的气象数据接口来获取天气信息。这篇教程将介绍以下内容：获取中国天气网的气象数据在微信公众平台中回复天气

中国天气网

1、中国天气网提供了丰富的气象数据接口。下面我们介绍主要的几个

2、国家根节点接口该接口以XML格式列出所有的省（自治区、直辖市）的中文名称（quName）和拼音名称（pyName）及省会城市的天气信息该接口的主要功能是通过它获取省级节点的拼音名称。以广东为例：其pyName是“Guangdong”。

3、省级节点接口（以广东为例）该接口以XML格式列出当前省下辖所有市的中文名称（quName）、拼音名称（pyName）、中心坐标、天气信息以及城市编码。在这个接口中主要获取城市名称及相应的城市编码。例如，深圳的城市编码为：101280601。可以编写程序将全国城市拓扑结构采集下来。

4、实时天气数据（以深圳为例）该接口以JSON格式列出当前城市的实时天气状况。{ "weatherinfo": { "city": "深圳", "cityid": "101280601", "temp": "12", "WD": "东北风", "WS": "1级", "SD": "75%", "WSE": "1", "time": "21:20", "isRadar": "1", "Radar": "JC_RADAR_AZ9755_JB" }}实时天气数据参数说明，如下所示（3）

5、六日天气数据（以深圳为例）该接口以JSON格式列出当前城市的六日天气状况。{ "weatherinfo": { 媪青怍牙"city": "深圳", "city_en": "shenzhen", "date_y": "2014年2月15日", "date": "", "week": "星期六", "fchh": "18", "cityid": "101280601", "temp1": "12℃~18℃", "temp2": "16℃~21℃", "temp3": "17℃~23℃", "temp4": "11℃~18℃", "temp5": "10℃~15℃", "temp6": "12℃~17℃", "tempF1": "53.6℉~64.4℉", "tempF2": "60.8℉~69.8℉", "tempF3": "62.6℉~73.4℉", "tempF4": "51.8℉~64.4℉", "tempF5": "50℉~59℉", "tempF6": "53.6℉~62.6℉", "weather1": "多云", "weather2": "阴", "weather3": "多云", "weather4": "中雨", "weather5": "多云", "weather6": "阴", "img1": "1", "img2": "99", "img3": "2", "img4": "99", "img5": "1", "img6": "99", "img7": "8", "img8": "99", "img9": "1", "img10": "99", "img11": "2", "img12": "99", "img_single": "1", "img_title1": "多云", "img_title2": "多云", "img_title3": "阴", "img_title4": "阴", "img_title5": "多云", "img_title6": "多云", "img_title7": "中雨", "img_title8": "中雨", "img_title9": "多云", "img_title10": "多云", "img_title11": "阴", "img_title12": "阴", "img_title_single": "多云", "wind1": "微风", "wind2": "微风", "wind3": "微风", "wind4": "东北风3-4级", "wind5": "微风", "wind6": "微风", "fx1": "微风", "fx2": "微风", "fl1": "小于3级", "fl2": "小于3级", "fl3": "小于3级", "fl4": "3-4级", "fl5": "小于3级", "fl6": "小于3级", "index": "较舒适", "index_d": "建议着薄外套、开衫牛仔衫裤等服装。年老体弱者应适当添加衣物，宜着夹克衫、薄毛衣等。", "index48": "较舒适", "index48_d": "建议着薄外套、开衫牛仔衫裤等服装。年老体弱者应适当添加衣物，宜着夹克衫、薄毛衣等。", "index_uv": "最弱", "index48_uv": "最弱", "index_xc": "适宜", "index_tr": "适宜", "index_co": "舒适", "st1": "19", "st2": "13", "st3": "23", "st4": "16", "st5": "24", "st6": "18", "index_cl": "适宜", "index_ls": "适宜", "index_ag": "不易发" }}未来六日天气数据主要参数说明如下表所示

微信公众平台开发2

1、需要将城市编码对照表导入到数据库中，以下是SAE导入后截图

2、将城市名转为城市代码的方法，这将在用户发送城市名的时候调用function fromNameToCode($name){ $mysql_host = SAE_MYSQL_HOST_M; $mysql_host_s = SAE_MYSQL_HOST_S; $mysql_port = SAE_MYSQL_PORT; $mysql_user = SAE_MYSQL_USER; $mysql_password = SAE_MYSQL_PASS; $mysql_database = SAE_MYSQL_DB; $mysql_table = "weather"; $mysql_state = "SELECT * FROM ".$mysql_table." WHERE `cityName` = '".$name."'"; $con = mysql_connect($mysql_host.':'.$mysql_port, $mysql_user, $mysql_password, true); if (!$con){ die('Could not connect: ' . mysql_error()); } mysql_query("SET NAMES 'UTF8'"); mysql_select_db($mysql_database, $con); $result = mysql_query($mysql_state); $cityCode = ""; while($row = mysql_fetch_array($result)) { $cityCode = $row['cityCode']; break; } mysql_close($con); return $cityCode;}

3、编写接口调用函数，用于向天气网发送cURL请求，获取数据function httpRequest($url){ $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); $output = curl_exec($ch); curl_close($ch); if ($output === FALSE){ return "cURL Error: ". curl_error($ch); } return $output;}

4、编写获取天气数据的函数，这里获取实时天气和未来3日天气，并将返回结果封装成图文疙熳阊涓信息的数组function getWeatherInfo($cityName){ $cityCode = fromNameToCode($cityName); if ($cityCode == "") { return "错误的城市名或者此城市不在数据库中!"; } //获取实时天气 $url = "http://www.weather.com.cn/data/sk/".$cityCode.".html"; $output = httpRequest($url); $weather = json_decode($output, true); $info = $weather['weatherinfo']; $weatherArray = array(); $weatherArray[] = array("Title"=>$info['city']."天气预报", "Description"=>"", "PicUrl"=>"", "Url" =>""); if ((int)$cityCode < 101340000){ $result = "实况 温度：".$info['temp']."℃ 湿度：".$info['SD']." 风速：".$info['WD'].$info['WSE']."级"; $weatherArray[] = array("Title"=>str_replace("%", "﹪", $result), "Description"=>"", "PicUrl"=>"", "Url" =>""); } //获取六日天气 $url = "http://m.weather.com.cn/data/".$cityCode.".html"; $output = httpRequest($url); $weather = json_decode($output, true); $info = $weather['weatherinfo']; if (!empty($info['index_d'])){ $weatherArray[] = array("Title" =>$info['index_d'], "Description" =>"", "PicUrl" =>"", "Url" =>""); } $weekArray = array("日","一","二","三","四","五","六"); $maxlength = 3; for ($i = 1; $i <= $maxlength; $i++) { $offset = strtotime("+".($i-1)." day"); $subTitle = date("m月d日",$offset)." 周".$weekArray[date('w',$offset)]." ".$info['temp'.$i]." ".$info['weather'.$i]." ".$info['wind'.$i]; $weatherArray[] = array("Title" =>$subTitle, "Description" =>"", "PicUrl" =>"http://discuz.comli.com/weixin/weather/"."d".sprintf("%02u",$info['img'.(($i *2)-1)]).".jpg", "Url" =>""); } return $weatherArray;}

5、在微信公众平台接口函数中处理收到的文本消息时，文本将为城市名，直接调用获取天气的函墙绅褡孛数/* 方倍工辑湃形傥作室 CopyRight 2013 All Rights Reserved*/define("TOKEN", "weixin");$wechatObj = new wechatCallbackapiTest();if (!isset($_GET['echostr'])) { $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, 'SimpleXMLElement', 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 = "欢迎关注方倍工作室 "; break; case "unsubscribe": $content = "取消关注"; break; } $result = $this->transmitText($object, $content); return $result; } private function receiveText($object) { $keyword = trim($object->Content); include("weather.php"); $content = getWeatherInfo($keyword); $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['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 $result; } private function logger($log_content) { }}

效果演示3

1、成型后的演示效果如下

如何扩展4

1、在数据库加入邮编、区号、拼音等字段，可以扩展成使用区号等方式查询

2、拥有高级接口的用户，可以使用结合语音识别+中文分词技术，实现语音版的智能查询