微信公众平台开发之天气预报功能

最近有项目需求给微信公众号上增加了天气预报功能,使用百度提供的车联网API V3.0中的天气查询功能实现.先上一张最终效果图:

项目需求：有连接好的微信平台,有百度注册帐号,需要在百度LBS开放云平台,添加应用,获取AK代码，PHP代码编辑器,如EditPlus等

下面详细介绍下开发步骤：

第一步：准备工作

      登录微信公众平台,检查服务器配置是否已启用,URL(服务器地址) 是否已配置Token(令牌),与自己写的微信入口文件中的Token(令牌一致),如下图:然后点击提交,只至网页上提示绿色背景的提交成功信息,则完成本步骤的操作

第二步：微信天气预报数据源准备

      用已注册好的百度帐号,登录百度LBS云平台,添加一个应用,获取访问应用AK，及了解车联API V3.0,天气查询功能相应的接口说明文件,以按需调用需要的天气信息.

第三步：微信公众平台，接口文件编写 jiekou.php

<?php/* 无忧电脑技巧网 微信公众号功能源码 CopyRight 2015 All Rights Reserved*/define("TOKEN", "weixin2015");$wechatObj = new wechatCallbackapiTest();if (!isset($_GET['echostr'])) { $wechatObj->responseMsg();}else{ $wechatObj->valid();}class wechatCallbackapiTest{ //验证签名 public function valid() { $echoStr = $_GET["echostr"]; $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){  echo $echoStr;  exit; } } public function responseMsg() { // $postStr = $GLOBALS["HTTP_RAW_POST_DATA"]; $postStr = file_get_contents("php://input"); if (!empty($postStr)){  $this->logger("R ".$postStr);  $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);  $RX_TYPE = trim($postObj->MsgType); $result = "";  switch ($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) { switch ($object->Event) {  case "subscribe":  $content = "欢迎关注无忧电脑技巧网 ";  break; } $result = $this->transmitText($object, $content); return $result; } private function receiveText($object) { $keyword = trim($object->Content); //获得用户输入的信息 //判断天气 if(!empty( $keyword )){ //!empty 函数,判断 $keyword获得的值是否为空 $city = mb_substr($keyword, 0, 2, 'utf-8'); //取用户输入内容前两个字符,如"黄冈天气" 最终取值"黄冈" include("weather.php"); //调用天气接口文件 $content = getWeatherInfo($city); //执行天气接口文件中的 getWeatherInfo方法.查询 黄冈天气. } else{ $content = date("Y-m-d H:i:s",time())."/n技术支持 无忧电脑技巧网/nwww.51pcjq.com"; //发送其它内容默认回复的内容. } if(is_array($content)){ if (isset($content[0]['PicUrl'])){  $result = $this->transmitNews($object, $content); }else if (isset($content['MusicUrl'])){  $result = $this->transmitMusic($object, $content); } }else{ $result = $this->transmitText($object, $content); } return $result; } private function transmitText($object, $content) { if (!isset($content) || empty($content)){ return ""; } $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, $newsArray) { if(!is_array($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']); } $newsTpl = "<xml><ToUserName><![CDATA[%s]]></ToUserName><FromUserName><![CDATA[%s]]></FromUserName><CreateTime>%s</CreateTime><MsgType><![CDATA[news]]></MsgType><Content><![CDATA[]]></Content><ArticleCount>%s</ArticleCount><Articles>$item_str</Articles></xml>"; $result = sprintf($newsTpl, $object->FromUserName, $object->ToUserName, time(), count($newsArray)); return $result; } private function logger($log_content) { }}