PHP WeChat public platform development reply function example code

This article mainly introduces the fourth article of PHP WeChat public platform development, WeChat reply function development, which has certain reference value. Interested friends can refer to it

1. Introduction

The WeChat public platform can make judgments based on the information sent by users, and then give corresponding replies, which has good interactivity. The following will simulate a simple reply function. Based on this case, developers can also basically understand the principles of WeChat interaction and conduct deeper development.

2. Idea analysis

We can extract keywords from the text messages sent by users, and use simple if...elseif...else... accomplish.

The key code is as follows:

if($keyword=="你好"){
　　$contentStr = "hello";
}elseif($keyword=="苏州"){
　　$contentStr = "上有天堂，下有苏杭";
}else{
　　$contentStr = "感谢您关注【卓锦苏州】 微信号：zhuojinsz";
}

If the user sends "Hello", then reply "hello", if the user sends "Suzhou", then reply " There is heaven above, Suzhou and Hangzhou below." For other information, I will reply with your welcome message.

3. Complete code

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

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

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, &#39;SimpleXMLElement&#39;, LIBXML_NOCDATA);
        $RX_TYPE = trim($postObj->MsgType);

        switch($RX_TYPE)
        {
          case "text":
            $resultStr = $this->handleText($postObj);
            break;
          case "event":
            $resultStr = $this->handleEvent($postObj);
            break;
          default:
            $resultStr = "Unknow msg type: ".$RX_TYPE;
            break;
        }
        echo $resultStr;
    }else {
      echo "";
      exit;
    }
  }

  public function handleText($postObj)
  {
    $fromUsername = $postObj->FromUserName;
    $toUsername = $postObj->ToUserName;
    $keyword = trim($postObj->Content);
    $time = time();
    $textTpl = "<xml>
          <ToUserName><![CDATA[%s]]></ToUserName>
          <FromUserName><![CDATA[%s]]></FromUserName>
          <CreateTime>%s</CreateTime>
          <MsgType><![CDATA[%s]]></MsgType>
          <Content><![CDATA[%s]]></Content>
          <FuncFlag>0</FuncFlag>
          </xml>";       
    if(!empty( $keyword ))
    {
      $msgType = "text";

      if($keyword=="你好"){
        $contentStr = "hello";
      }elseif($keyword=="苏州"){
        $contentStr = "上有天堂，下有苏杭";
      }else{
        $contentStr = "感谢您关注【卓锦苏州】 微信号：zhuojinsz";
      }
      $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
      echo $resultStr;
    }else{
      echo "Input something...";
    }
  }

  public function handleEvent($object)
  {
    $contentStr = "";
    switch ($object->Event)
    {
      case "subscribe":
        $contentStr = "感谢您关注【卓锦苏州】"."\n"."微信号：zhuojinsz"."\n"."卓越锦绣，名城苏州，我们为您提供苏州本地生活指南，苏州相关信息查询，做最好的苏州微信平台。"."\n"."目前平台功能如下："."\n"."【1】 查天气，如输入：苏州天气"."\n"."【2】 查公交，如输入：苏州公交178"."\n"."【3】 翻译，如输入：翻译I love you"."\n"."【4】 苏州信息查询，如输入：苏州观前街"."\n"."更多内容，敬请期待...";
        break;
      default :
        $contentStr = "Unknow Event: ".$object->Event;
        break;
    }
    $resultStr = $this->responseText($object, $contentStr);
    return $resultStr;
  }
  
  public function responseText($object, $content, $flag=0)
  {
    $textTpl = "<xml>
          <ToUserName><![CDATA[%s]]></ToUserName>
          <FromUserName><![CDATA[%s]]></FromUserName>
          <CreateTime>%s</CreateTime>
          <MsgType><![CDATA[text]]></MsgType>
          <Content><![CDATA[%s]]></Content>
          <FuncFlag>%d</FuncFlag>
          </xml>";
    $resultStr = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time(), $content, $flag);
    return $resultStr;
  }


  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;
    }
  }
}

?>

4. Test

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