PHP微信开发之查询城市天气

PHP微信查询城市天气，首先，你需要找到一个获取天气的API，此处，我用的是百度的apistore，申请和使用API的网址：http://apistore.baidu.com/apiworks/servicedetail/112.html 

登录百度账号，并用手机发送请求获取apikey。有了apikey，可以按照它的示例来请求城市天气了。（可以按照城市中文名，拼音，城市编号等来查询） 

你可以现在本地做测试，请求完成之后，再放到自己的域名空间的脚本里。
 测试的脚本例如：（注意apikey填写自己申请的） 

header('Content-type:text/html;charset=UTF-8');$ch = curl_init();$url = 'http://apis.baidu.com/apistore/weatherservice/cityname?cityname=上海';$header = array( 'apikey: ',//你的apikey);// 添加apikey到headercurl_setopt($ch, CURLOPT_HTTPHEADER , $header);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);// 执行HTTP请求curl_setopt($ch , CURLOPT_URL , $url);$res = curl_exec($ch);$res = json_decode($res, true);echo "<pre>";print_r($res);echo "</pre>";$contentStr = "";foreach($res as $k=>$v){ if($k == "retData"){ $contentStr = "城市：" . $v['city'] . "/n"; $contentStr .= "日期：" . $v['date'] . "/n"; $contentStr .= "天气：" . $v['weather'] ."/n"; $contentStr .= "平均气温：" . $v['temp'] . "℃/n"; $contentStr .= "最低气温：" . $v['l_tmp'] ."℃/n"; $contentStr .= "最高气温：" . $v['h_tmp'] . "℃/n"; $contentStr .= "风力：" . $v['WS'] . "/n"; $contentStr .= "风向：" . $v['WD'] . "/n"; $contentStr .= "日出时间：" . $v['sunrise'] . "/n"; $contentStr .= "日落时间：" . $v['sunset'] . "/n"; $contentStr .= "经度：" . $v['longitude'] . "/n"; $contentStr .= "纬度：" . $v['latitude']; }}echo $contentStr;

如果你填写了自己的apikey，那么应该能获取到所请求的天气了： 

如果能返回正常的数据了，那么就可以放到你的域名空间里了。（公众平台里开发者中心填写的url，该url有连接微信接口等功能）
如果你看不懂下面的代码或者第一次接触微信开发，可以参考我之前的文章：//www.Cuoxin.com/article/87252.htm

下面的代码是responseMsg的一部分：   

 public function responseMsg(){ <span style="white-space:pre"> </span>//get post data, May be due to the different environments $postStr = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信发来的XML数据 //extract post data if(!empty($postStr)){    //解析post来的XML为一个对象$postObj  $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);   $fromUsername = $postObj->FromUserName; //请求消息的用户  $toUsername = $postObj->ToUserName; //"我"的公众号id  $keyword = trim($postObj->Content); //用户发送的消息内容  $time = time(); //时间戳  $msgtype = 'text'; //消息类型：文本  $textTpl = "<xml> <ToUserName><![CDATA[%s]]></ToUserName> <FromUserName><![CDATA[%s]]></FromUserName> <CreateTime>%s</CreateTime> <MsgType><![CDATA[%s]]></MsgType> <Content><![CDATA[%s]]></Content> </xml>";  if($postObj->MsgType == 'event'){ //如果XML信息里消息类型为event  if($postObj->Event == 'subscribe'){ //如果是订阅事件   $contentStr = "欢迎订阅misaka去年夏天！/n更多精彩内容：http://blog.csdn.net/misakaqunianxiatian";   $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgtype, $contentStr);   echo $resultStr;   exit();  }  }  $which = mb_substr($keyword, 0, 2, 'UTF-8');//获取要返回什么样的信息  if($which== "翻译"){ //如果要进行翻译  //调用有道翻译API进行翻译  }elseif($which == "天气"){  $wea = $which;  $city = str_replace($wea, "", $keyword);  $ch = curl_init();  $url = 'http://apis.baidu.com/apistore/weatherservice/cityname?cityname=' . $city;  $header = array('apikey: '); //此处的apikey使用自己申请的apikey，填在冒号之后  // 添加apikey到header  curl_setopt($ch, CURLOPT_HTTPHEADER , $header);  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  // 执行HTTP请求  curl_setopt($ch , CURLOPT_URL , $url);  $res = curl_exec($ch);  $res = json_decode($res, true);  $contentStr = "";  foreach($res as $k=>$v){   if($k == "retData"){   $contentStr = "城市：" . $v['city'] . "/n";   $contentStr .= "日期：" . $v['date'] . "/n";   $contentStr .= "天气：" . $v['weather'] ."/n";   $contentStr .= "平均气温：" . $v['temp'] . "℃/n";   $contentStr .= "最低气温：" . $v['l_tmp'] ."℃/n";   $contentStr .= "最高气温：" . $v['h_tmp'] . "℃/n";   $contentStr .= "风力：" . $v['WS'] . "/n";   $contentStr .= "风向：" . $v['WD'] . "/n";   $contentStr .= "日出时间：" . $v['sunrise'] . "/n";   $contentStr .= "日落时间：" . $v['sunset'] . "/n";   $contentStr .= "经度：" . $v['longitude'] . "/n";   $contentStr .= "纬度：" . $v['latitude'];   }  }  $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgtype, $contentStr);  echo $resultStr;  exit();  }else{  $contentStr = "输入翻译XXX可以进行翻译(=・ω・=)/n/n输入天气XX可以查询城市天气";  $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgtype, $contentStr);  echo $resultStr;  exit();  }