微信公众号开发之（26）字符串截取

字符串截取：

函数学习

• 字符串长度函数:strlen()
• utf-8,3位
• substr($a,num,length) :num:字符截取位置：-6（倒数第6个开始）
• empty()
  

核心代码如下：

 $postObj = simplexml_load_string($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.'\n'.$d2.'\n'.$d3;
                 if (empty($content))
                 {
                     $content="你输入的地区有误";}
                 }
                 else
                 {

                     $content="请输入地区天气,如北京天气进行天气情况查询";
                 }                             
                 $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time,$content);
                 echo $resultStr;

index.php整体代码如下：

<?php
/**
  * wechat php test
  */

//define your token
define("TOKEN", "weixin");
$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.'\n'.$d2.'\n'.$d3;
                 if (empty($content))
                 {
                     $content="你输入的地区有误";}
                 }
                 else
                 {

                     $content="请输入地区天气,如北京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;
        }
    }
}

?>