在這篇教程中，我們將介紹如何在微信公眾平臺上開發天氣預報功能。我們將使用中國天氣網的氣象數據接口來獲取天氣信息。
這篇教程將介紹以下內容：
一、中國天氣網
中國天氣網提供了豐富的氣象數據接口。下面我們介紹主要的幾個：
國家根節點接口：
http://Flash.weather.com.cn/wmaps/xml/china.xml
該接口以XML格式列出所有的省（自治區、直轄市）的中文名稱（quName）和拼音名稱（pyName）及省會城市的天氣信息，其中廣東的數據如下：
<city quName="廣東" pyName="guangdong" cityname="廣州" state1="2" state2="7" stateDetailed="陰轉小雨" tem1="8" tem2="15" windState="微風"/>
該接口的主要功能是通過它獲取省級節點的拼音名稱。以廣東為例：其pyName是“Guangdong”。
省級節點接口（以廣東為例）：
http://flash.weather.com.cn/wmaps/xml/Guangdong.xml
該接口以XML格式列出當前省下轄所有市的中文名稱（quName）、拼音名稱（pyName）、中心坐標、天氣信息以及城市編碼。其中深圳的數據如下所示：
<city cityX="409" cityY="257" cityname="深圳" centername="深圳" fontColor="FFFFFF" pyName="shenzhen" state1="1" state2="1" stateDetailed="多云" tem1="12" tem2="18" temNow="12" windState="微風" windDir="東北風" windPower="1級" humidity="74%" time="21:15" url="101280601"/>
在這個接口中主要獲取城市名稱及相應的城市編碼。例如，深圳的城市編碼為：101280601。可以編寫程序將全國城市拓撲結構采集下來。也可以使用方倍工作室已經采集好的，點擊這里下載。
實時天氣數據（以深圳為例）：
http://www.weather.com.cn/data/sk/101280601.html
該接口以JSON格式列出當前城市的實時天氣狀況。如下所示：
{ "weatherinfo": { "city": "深圳", "cityid": "101280601", "temp": "12", "WD": "東北風", "WS": "1級", "SD": "75%", "WSE": "1", "time": "21:20", "isRadar": "1", "Radar": "JC_RADAR_AZ9755_JB" }}實時天氣數據參數說明下所示：
六日天氣數據（以深圳為例）：
http://m.weather.com.cn/data/101280601.html
該接口以JSON格式列出當前城市的六日天氣狀況。如下所示：
{ "weatherinfo": { "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": "陰", "weather3": "多云", "weather4": "中雨", "weather5": "多云", "weather6": "陰", "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": "陰", "img_title4": "陰", "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": "陰", "img_title12": "陰", "img_title_single": "多云", "wind1": "微風", "wind2": "微風", "wind3": "微風", "wind4": "東北風3-4級", "wind5": "微風", "wind6": "微風", "fx1": "微風", "fx2": "微風", "fl1": "小于3級", "fl2": "小于3級", "fl3": "小于3級", "fl4": "3-4級", "fl5": "小于3級", "fl6": "小于3級", "index": "較舒適", "index_d": "建議著薄外套、開衫牛仔衫褲等服裝。年老體弱者應適當添加衣物，宜著夾克衫、薄毛衣等。", "index48": "較舒適", "index48_d": "建議著薄外套、開衫牛仔衫褲等服裝。年老體弱者應適當添加衣物，宜著夾克衫、薄毛衣等。", "index_uv": "最弱", "index48_uv": "最弱", "index_xc": "適宜", "index_tr": "適宜", "index_co": "舒適", "st1": "19", "st2": "13", "st3": "23", "st4": "16", "st5": "24", "st6": "18", "index_cl": "適宜", "index_ls": "適宜", "index_ag": "不易發" }}未來六日天氣數據主要參數說明如下表所示：
以上接口是我們做天氣預報功能將使用到的接口。
二、微信公眾平臺開發
1. 需要將城市編碼對照表導入到數據庫中，以下是SAE導入后截圖
2. 將城市名轉為城市代碼的方法，這將在用戶發送城市名的時候調用
1 function fromNameToCode($name) 2 { 3 $MySQL_host = SAE_MYSQL_HOST_M; 4 $mysql_host_s = SAE_MYSQL_HOST_S; 5 $mysql_port = SAE_MYSQL_PORT; 6 $mysql_user = SAE_MYSQL_USER; 7 $mysql_passWord = SAE_MYSQL_PASS; 8 $mysql_database = SAE_MYSQL_DB; 9 10 $mysql_table = "weather";11 $mysql_state = "SELECT * FROM ".$mysql_table." WHERE `cityName` = '".$name."'";12 13 $con = mysql_connect($mysql_host.':'.$mysql_port, $mysql_user, $mysql_password, true);14 if (!$con){15 die('Could not connect: ' . mysql_error());16 }17 mysql_query("SET NAMES 'UTF8'");18 mysql_select_db($mysql_database, $con);19 $result = mysql_query($mysql_state);20 $cityCode = "";21 while($row = mysql_fetch_array($result))22 {23 $cityCode = $row['cityCode']; 24 break;25 }26 mysql_close($con);27 return $cityCode;28 }3. 編寫接口調用函數，用于向天氣網發送cURL請求，獲取數據
1 function httPRequest($url) 2 { 3 $ch = curl_init(); 4 curl_setopt($ch, CURLOPT_URL, $url); 5 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 6 $output = curl_exec($ch); 7 curl_close($ch); 8 if ($output === FALSE){ 9 return "cURL Error: ". curl_error($ch);10 }11 return $output;12 }
4. 編寫獲取天氣數據的函數，這里獲取實時天氣和未來3日天氣，并將返回結果封裝成圖文信息的數組
1 function getWeatherInfo($cityName) 2 { 3 $cityCode = fromNameToCode($cityName); 4 5 if ($cityCode == "") 6 { 7 return "錯誤的城市名或者此城市不在數據庫中!"; 8 } 9 10 //獲取實時天氣11 $url = "http://www.weather.com.cn/data/sk/".$cityCode.".html";12 $output = httpRequest($url);13 $weather = json_decode($output, true); 14 $info = $weather['weatherinfo'];15 16 $weatherArray = array();17 $weatherArray[] = array("Title"=>$info['city']."天氣預報", "Descr5. 在微信公眾平臺接口函數中處理收到的文本消息時，文本將為城市名，直接調用獲取天氣的函數
1 /* 2 方倍工作室 3 CopyRight 2013 All Rights Reserved 4 */ 5 6 define("TOKEN", "weixin"); 7 8 $wechatObj = new wechatCallbackapiTest(); 9 if (!isset($_GET['echostr'])) { 10 $wechatObj->responseMsg(); 11 }else{ 12 $wechatObj->valid(); 13 } 14 15 class wechatCallbackapiTest 16 { 17 public function valid() 18 { 19 $echoStr = $_GET["echostr"]; 20 if($this->checkSignature()){ 21 echo $echoStr; 22 exit; 23 } 24 } 25 26 private function checkSignature() 27 { 28 $signature = $_GET["signature"]; 29 $timestamp = $_GET["timestamp"]; 30
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