微信公众号用百度车联网API回复天气预报

1.申请百度地图开发平台访问应用（AK）;



点创建应用



然后提交，AK就申请好了；

2.然后我们看下百度的车联网API中的天气查询，这是链接车联网API

这是API上面的接口实例http://api.map.baidu.com/telematics/v3/weather?location=北京&output=json&ak=E4805d16520de693a3fe707cdc962045

点看链接我们可以看到返回结果；返回结果可以是xml,也可以是json，

默认的是xml,这里返回的是json格式；

【提示：在代码中城市名是需要urlencode(城市名)转换的

这里 北京 =>%E5%8C%97%E4%BA%AC 】

3.然后我们可以编写代码了0.0

回复文本的消息

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>12345678</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[你好]]></Content>
</xml>

回复图文消息

<xml>
<ToUserName><![CDATA[toUser]]></ToUserName>
<FromUserName><![CDATA[fromUser]]></FromUserName>
<CreateTime>12345678</CreateTime>
<MsgType><![CDATA[news]]></MsgType>
<ArticleCount>2</ArticleCount>
<Articles>
<item>
<Title><![CDATA[title1]]></Title>
<Description><![CDATA[description1]]></Description>
<PicUrl><![CDATA[picurl]]></PicUrl>
<Url><![CDATA[url]]></Url>
</item>
<item>
<Title><![CDATA[title]]></Title>
<Description><![CDATA[description]]></Description>
<PicUrl><![CDATA[picurl]]></PicUrl>
<Url><![CDATA[url]]></Url>
</item>
</Articles>
</xml>

然后贴出我的代码

<?php
define("TOKEN", "weixin");
$wechatObj = new wechatCallbackapiTest();
if (isset($_GET['echostr'])) {
$wechatObj->valid();
}else{
$wechatObj->responseMsg();
}

class wechatCallbackapiTest
{
public function valid()
{
$echoStr = $_GET["echostr"];
if($this->checkSignature()){
header('content-type:text');
echo $echoStr;
exit;
}
}

private function checkSignature()
{
$signature = $_GET["signature"];
$timestamp = $_GET["timestamp"];
$nonce = $_GET["nonce"];

$token = TOKEN;
$tmpArr = array($token, $timestamp, $nonce);
sort($tmpArr, SORT_STRING);
$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)){
$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);

$city = trim($postObj->Content);
$report_arr = $this->receiveWeather($city);
if($report_arr['status'] != "success"){
$content = "请输入正确的城市名";
$resultStr = $this->transmitText($postObj,$content);
}
else{
$itemTpl = "<item>
<Title><![CDATA[【%s】%s %s %s %s]]></Title>
<Description><![CDATA[]]></Description>
<PicUrl><![CDATA[%s]]></PicUrl>
<Url><![CDATA[http://m.hao123.com/a/tianqi]]></Url>
</item>";

$item_str = "";
foreach ($report_arr['weather_data'] as $item)
$item_str .= sprintf($itemTpl, $city, $item['date'], $item['weather'], $item['wind'], $item['temperature'], $item['dayPictureUrl']);
$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[news]]></MsgType>
<ArticleCount>%s</ArticleCount>
<Articles>
$item_str
</Articles>
</xml>";
$resultStr = sprintf($textTpl, $postObj->FromUserName, $postObj->ToUserName, time(), count($report_arr['weather_data']));
}

echo $resultStr;
}
}
private function receiveWeather($cityName){
$ak = "输入你自己申请的AK";
$url = "http://api.map.baidu.com/telematics/v3/weather?location=".urlencode($cityName)."&output=json&ak=$ak";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);    // 设置你需要抓取的URL
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);    // 设置cURL 参数，要求结果保存到字符串中还是输出到屏幕上。
$output = curl_exec($ch);   // 运行cURL，请求网页
curl_close($ch);
$result = json_decode($output, true);
$weather_report = array('weather_data' => $result['results'][0]['weather_data'],
'index' => $result['results'][0]['index'], 'status' => $result['status']);
return $weather_report;
}
//发送文本信息
private function transmitText($object,$content){
if (!isset($content) || empty($content)){
return "";
}
$xmlTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[%s]]></Content>
</xml>";
$result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, time(), $content);

return $result;
}
}
?>