微信公众平台开发接口之天气预报字符串截取

<?php

//define your token
define("TOKEN", "lizi");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->responseMsg();

class wechatCallbackapiTest
{
public function valid()
{
$echoStr = $_GET["echostr"];

//valid signature , option
if($this->checkSignature()){
echo $echoStr;
exit;
}
}

public function responseMsg()
{
//get post data, May be due to the different environments
$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];

//extract post data
if (!empty($postStr)){

$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
$fromUsername = $postObj->FromUserName;
$toUsername = $postObj->ToUserName;
$MsgType=$postObj->MsgType;
$keyword = trim($postObj->Content);
$time = time();
$textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content>%s</Content>
<FuncFlag>0</FuncFlag>
</xml>";

$strweather= substr($keyword,-6,6);
$strcity=substr($keyword,0,strlen($keyword)-6);
if($strweather=="天气")
{
$url="http://api.map.baidu.com/telematics/v2/weather?location={$strcity}&ak=1a3cde429f38434f1811a75e1a90310c";

$fa=file_get_contents($url);
$f=simplexml_load_string($fa);
$city=$f->currentCity;
$da1=$f->results->result[0]->date;
$da2=$f->results->result[1]->date;
$da3=$f->results->result[2]->date;
$w1=$f->results->result[0]->weather;
$w2=$f->results->result[1]->weather;
$w3=$f->results->result[2]->weather;
$p1=$f->results->result[0]->wind;
$p2=$f->results->result[1]->wind;
$p3=$f->results->result[2]->wind;
$q1=$f->results->result[0]->temperature;
$q2=$f->results->result[1]->temperature;
$q3=$f->results->result[2]->temperature;
$d1=$city.$da1.$w1.$p1.$q1;
$d2=$city.$da2.$w2.$p2.$q2;
$d3=$city.$da3.$w3.$p3.$q3;
$content=$d1.$d2.$d3;
if (empty($content))
{$content="你输入的地区有误";}
}
else{
$content="请输入地区天气,如武汉天气进行天气情况查询";
}
$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time,$content);
echo $resultStr;

}else {
echo "";
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;
}
}
}

?>