<?php
define("TOKEN", "YoonPer"); //TOKEN值
$wechatObj = new wechat();
$wechatObj->valid();
class wechat {
  public function valid() {
    $echoStr = $_GET["echostr"];
    if($this->checkSignature()){
      echo $echoStr;
      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;
    }
  }
}
?>

<xml>
<!--开发者微信号-->
<ToUserName><![CDATA[toUser]]></ToUserName>
<!--发送方帐号（OpenID）-->
<FromUserName><![CDATA[fromUser]]></FromUserName>
<!--消息创建时间 （整型）-->
<CreateTime>12345678</CreateTime>
<!--消息类别 （text文本消息）-->
<MsgType><![CDATA1]></MsgType>
<!--消息内容-->
<Content><![CDATA[content]]></Content>
<!--消息ID （64位整型）-->
<MsgId>1234567890123456</MsgId>
</xml>

<xml>
<!--接收方帐号（OpenID）-->
<ToUserName><![CDATA[toUser]]></ToUserName>
<!--开发者微信号-->
<FromUserName><![CDATA[fromUser]]></FromUserName>
<!--消息创建时间 （整型）-->
<CreateTime>12345678</CreateTime>
<!--消息类别 （text文本消息）-->
<MsgType><![CDATA1]></MsgType>
<!--回复消息内容-->
<Content><![CDATA[content]]></Content>
<!--星标操作（位0x0001被标志时 星标刚收到的消息）-->
<FuncFlag>0</FuncFlag>
</xml>

<?php
/*-------------------------------------------------
|   index.php [ 微信公众平台接口 ]
+--------------------------------------------------
|   Author: LimYoonPer
+------------------------------------------------*/
$wechatObj = new wechat();
$wechatObj->responseMsg();
class wechat {
 public function responseMsg() {
  //---------- 接 收 数 据 ---------- //
  $postStr = $GLOBALS["HTTP_RAW_POST_DATA"]; //获取POST数据
  //用SimpleXML解析POST过来的XML数据
  $postObj = simplexml_load_string($postStr,'SimpleXMLElement',LIBXML_NOCDATA);
  $fromUsername = $postObj->FromUserName; //获取发送方帐号（OpenID）
  $toUsername = $postObj->ToUserName; //获取接收方账号
  $keyword = trim($postObj->Content); //获取消息内容
  $time = time(); //获取当前时间戳
  //---------- 返 回 数 据 ---------- //
  //返回消息模板
  $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>";
  $msgType = "text"; //消息类型
  include('simsimi.php');
  $contentStr = simsimi($keyword); //返回消息内容
  //格式化消息模板
  $resultStr = sprintf($textTpl,$fromUsername,$toUsername,$time,$msgType,$contentStr);
  echo $resultStr; //输出结果
 }
}
?>

<?php
/*-------------------------------------------------
|   simsimi.php [ 智能聊天（simsimi） ]
+--------------------------------------------------
|   Author: LimYoonPer
+------------------------------------------------*/

function simsimi ($keyword)
{
  $keyword = urlencode($keyword);
  //----------- 获取COOKIE ----------//
  $url = "http://www.simsimi.com/";
  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_HEADER, 1);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  $content = curl_exec($ch);
  list($header, $body) = explode("\r\n\r\n", $content);
  preg_match_all("/set\-cookie:([^\r\n]*);/iU", $header, $matches);
  $cookie = implode(';', $matches[1]).";simsimi_uid=1;";
  curl_close($ch);
  //----------- 抓 取 回 复 ----------//
  $url = "http://www.simsimi.com/func/reqN?lc=ch&ft=0.0&req=$keyword&fl=http%3A%2F%2Fwww.simsimi.com%2Ftalk.htm";
  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_COOKIE, $cookie);
  $content = json_decode(curl_exec($ch), 1);
  curl_close($ch);
  if ( $content['result'] == '200' ) {
    return $content['sentence_resp'];
  } else {
    return '我还不会回答这个问题...';
  }
}
?>