本篇文章为大家展示了使用php怎么在微信公众平台开发SDK扩展，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

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 代码如下:

define("TOKEN", "xingans");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->responseMsg();
class wechatCallbackapiTest
{
   //签名验证公共接口
   public function valid()
   {
       $echoStr = $_GET["echostr"];
       if($this->checkSignature()){
           echo $echoStr;
           exit;
       }
   }
 
   //主入口处理函数
   public function responseMsg()
   {
       $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
       if (!emptyempty($postStr)){
           $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
           $msgType=trim($postObj->MsgType);
          
           switch($msgType){
               case 'text':
                   $resultStr=$this->handleText($postObj);
                   break;
               case 'event':
                   $resultStr=$this->handleEvent($postObj);
                   break;
               default:
                   $resultStr=$this->handleDefault($postObj);
                   break;
           }
           echo $resultStr;
          
       }else {
           echo "Error";
           exit;
       }
   }
  
   //处理文本消息
      private function handleText($obj){
          $keyword=trim($obj->Content);
          if(preg_match('/天气/',$keyword)){
              $contentStr=$this->handleWeather($obj);
          }elseif(preg_match('/翻译/',$keyword)){
              $contentStr=$this->handleTranslation($obj);
          }else{
              $contentStr=$this->handleChat($obj);
          }
          return $this->handleStr($obj,$contentStr);
      }
     
      //处理天气
      private function handleWeather($obj){
          $keyword=mb_substr($obj->Content,-2,2,'utf-8');
          $zone=mb_substr($obj->Content,0,-2,'utf-8');
          if($keyword=='天气' && !emptyempty($zone)){
              $zoneArr=json_decode(file_get_contents('/tupian/20230522/app=weather
              $zoneArr=$zoneArr['result'];
              $cityId='';
              foreach($zoneArr as $value){
                  if($zone==$value['citynm']){
                      $cityId=$value['weaid'];
                      break;
                  }
              }
             
              if(!emptyempty($cityId)){
                  $data=file_get_contents("/tupian/20230522/app=weather
                  $data=json_decode($data);
                  $contentStr="今天是:".$data->result->days.",".$data->result-> week.",".$data->result->citynm."天气:".$data->result->weather."n温度:".$data->result->temperature.",
                  ".$data->result->wind_direction.",".$data->result->wind_power.", 最低温度:".$data->result->temp_low.",高温度:".$data->result->temp_high;
              }else{
                  $contentStr='找不到输入的城市!';
              }   
          }else{
              $contentStr='输入的查询格式不正确!';
          }
          return $contentStr;
      }
     
      //处理翻译
      private function handleTranslation($obj){
       $keyword=mb_substr($obj->Content,0,2,'utf-8');
       $words=mb_substr($obj->Content,2,220,'utf-8');
       if($keyword=='翻译' && !emptyempty($words)){
           $data=file_get_contents('http://fanyi.youdao.com/openapi.do?keyfrom=zfsblog&key=364295447&type=data&doctype=json&version=1.1&q='.urlencode($words));       
           $data=json_decode($data,true);
          
           switch($data['errorCode']){
               case '0':
                   $contentStr=$data['translation'][0];
                   break;
               case '20':
                   $contentStr='要翻译的文本过长';
                   break;
               case '30':
                   $contentStr='无法进行有效的翻译';
                   break;
               case '40':
                   $contentStr='不支持的语言类型';
                   break;
               case '50':
                   $contentStr='无效的key';
                   break;
               default:
                   $contentStr='Error';
                   break;
           }
       }else{
           $contentStr='输入的翻译格式不正确!';
       }
       return $contentStr;
      }
     
      //处理聊天信息
      private function handleChat($obj){
       $keywords=$obj->Content;
       $curlPost=array("chat"=>$keywords);
       $ch = curl_init();//初始化curl
       curl_setopt($ch, CURLOPT_URL,'http://www.xiaojo.com/bot/chata.php');//抓取指定网页
       curl_setopt($ch, CURLOPT_HEADER, 0);//设置header
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);//要求结果为字符串且输出到屏幕上
       curl_setopt($ch, CURLOPT_POST, 1);//post提交方式
       curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);
       $data = curl_exec($ch);//运行curl
       curl_close($ch);
      
       if(!emptyempty($data)){
           $contentStr=$data;
       }else{
           $ran=rand(1,5);
          
           switch($ran){
               case 1:
                   $contentStr= "小九今天累了，明天再陪你聊天吧";
                   break;
               case 2:
                   $contentStr= "小九睡觉喽~~";
                   break;
               case 3:
                   $contentStr= "呼呼~~呼呼~~";
                   break;
               case 4:
                   $contentStr= "你话好多啊，不跟你聊了";
                   break;
               case 5:
                   $contentStr= "你话好多啊，不跟你聊了";
                   break;
           }
       }
       return $contentStr;
      }
     
      //创建自定义菜单
      public function createMenu($data,$token){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "/tupian/20230522/create
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $result = curl_exec($ch);     
        curl_close($ch);
        return $result;
      }
     
      //查询自定义菜单
   function getMenu($token){
       $url="/tupian/20230522/get
       $ch = curl_init($url);
       curl_setopt($ch, CURLOPT_RETURNTRANSFER,true) ; //获取数据返回
       curl_setopt($ch, CURLOPT_BINARYTRANSFER,true) ; //在启用 CURLOPT_RETURNTRANSFER 时候将获取数据返回   
       curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);
       curl_setopt($ch, CURLOPT_SSL_VERIFYHOST,false);
       return $output = curl_exec($ch);       
      }
     
      //删除自定义菜单
      public function deleteMenu($token){
       $url="/tupian/20230522/delete
       $ch = curl_init();
       curl_setopt($ch, CURLOPT_URL, $url);
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
       curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
       curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
       $result = curl_exec($ch);
       curl_close($ch);
       return $result;
      }

      //处理事件消息
      private function handleEvent($obj){
          $content='';
          switch($obj->Event){
              case 'subscribe':
                  $content.="welcome-欢迎关注该公众号号!";
                  break;
              case 'unsubscribe':
                  $content.="感谢您一直以来对该公众号的关注,再见!";
                  break;
              default:
                  $content.="";
                  break;
          }
          return $this->handleStr($obj,$content);
      }
     
      //处理回复消息字符串
      private function handleStr($obj,$content='',$flag=0){
       $textTpl = "";
       return sprintf($textTpl, $obj->FromUserName, $obj->ToUserName, time(), $content,$flag);
      }
  
   //签名验证函数
   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;
       }
   }
}

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