XMWX/wechat/demo.php

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

//define your token
define("TOKEN", "xiaomo");
$wechatObj = new wechatCallbackapiTest();
if (isset($_GET['echostr'])) {
	$wechatObj->valid();
}
$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"];
		$postStr = file_get_contents("php://input");
		file_put_contents("./demo.txt",date("Y-m-d H:i:s")."  ".json_encode($postStr).PHP_EOL,FILE_APPEND);
      	//extract post data
		if (!empty($postStr)){
                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
                   the best way is to check the validity of xml by yourself */
                libxml_disable_entity_loader(true);
              	$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $type=$postObj->MsgType;
                $event="";
                if ($type =='event'){
                	 $event=$postObj->Event;
                }
                $time = time();
                $textTpl = "<xml>
							<ToUserName><![CDATA[%s]]></ToUserName>
							<FromUserName><![CDATA[%s]]></FromUserName>
							<CreateTime>%s</CreateTime>
							<MsgType><![CDATA[%s]]></MsgType>
							<Content><![CDATA[%s]]></Content>
							</xml>";             
				if(!empty( $keyword ) || $event =="subscribe")
                {
                	$msgType = "text";
              		if ($event == "subscribe"){
              			$contentStr = "欢迎关注，此号可以自由聊天^_^";
              		}else{
						if (strpos($keyword,"主人") !== false){
							$contentStr="我的主人是宇宙无敌超级大帅哥--人称陌帅";
						}else{
              				$contentStr = $this->simsimiHttp($keyword);
						}
              		}
                	
                	$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                	echo $resultStr;
                }else{
                	echo "Input something...";
                }

        }else {
        	echo "";
        	exit;
        }
    }
		
	private function checkSignature()
	{
        // you must define TOKEN by yourself
        if (!defined("TOKEN")) {
            throw new Exception('TOKEN is not defined!');
        }
        
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];
        		
		$token = TOKEN;
		$tmpArr = array($token, $timestamp, $nonce);
        // use SORT_STRING rule
		sort($tmpArr, SORT_STRING);
		$tmpStr = implode( $tmpArr );
		$tmpStr = sha1( $tmpStr );
		
		if( $tmpStr == $signature ){
			return true;
		}else{
			return false;
		}
	}
	private function simsimiHttp($msg){
		$url="http://www.xiaodoubi.com/simsimiapi.php?msg=".$msg;
		$res = file_get_contents($url); 
		file_put_contents("./demo.txt",date("Y-m-d H:i:s")."  ".$res.PHP_EOL,FILE_APPEND);
		if (strpos($res,"xiaodouqqcom") !== false){
			$res="无法回答，请不要发一下奇怪的问题或字符😒";
		}
		return $res; 
	}
}

?>