?php
 
/**
 * WeixinCallback 
 * 
 * @package 
 * @version $id$
 * @copyright 1997-2005 The PHP Group
 * @author davidhhuan@126.com
 * {@link a  rel="external nofollow" target="_blank">http://www.sharefamily.net/a>}
 */
class Weixin
{
  //$_GET參數
  public $signature;
  public $timest
  public $nonce;
  public $echostr;
  //
  public $token;
  public $debug = false;
  public $msg = array();
  public $setFlag = false;
 
  /**
   * __construct 
   * 
   * @param mixed $params 
   * @access public
   * @return void
   */
  public function __construct($params)
  {
    foreach ($params as $k1 => $v1)
    {
      if (property_exists($this, $k1))
      {
        $this->$k1 = $v1;
      }
    }
  }
   
  /**
   * valid 
   * 
   * @access public
   * @return void
   */
  public function valid()
  {
    //valid signature , option
    if($this->checkSignature()){
      echo $this->echostr;
      Yii::app()->end();
    }
  }
 
  /**
   * 獲得用戶發過來的消息（消息內容和消息類型 ） 
   * 
   * @access public
   * @return void
   */
  public function init()
  {
    $postStr = empty($GLOBALS["HTTP_RAW_POST_DATA"]) ? '' : $GLOBALS["HTTP_RAW_POST_DATA"];
    if ($this->debug) 
    {
      $this->log($postStr);
    }
    if (!empty($postStr)) {
      $this->msg = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
    }
  }
 
  /**
   * makeEvent 
   * 
   * @access public
   * @return void
   */
  public function makeEvent()
  {
     
  }
 
  /**
   * 回復文本消息 
   * 
   * @param string $text 
   * @access public
   * @return void
   */
  public function makeText($text='')
  {
    $createTime = time();
    $funcFlag = $this->setFlag ? 1 : 0;
    $textTpl = "xml>
      ToUserName>![CDATA[{$this->msg->FromUserName}]]>/ToUserName>
      FromUserName>![CDATA[{$this->msg->ToUserName}]]>/FromUserName>
      CreateTime>{$createTime}/CreateTime>
      MsgType>![CDATA[text]]>/MsgType>
      Content>![CDATA[%s]]>/Content>
      FuncFlag>%s/FuncFlag>
      /xml>";
    return sprintf($textTpl,$text,$funcFlag);
  }
   
  /**
   * 根據數組參數回復圖文消息 
   * 
   * @param array $newsData 
   * @access public
   * @return void
   */
  public function makeNews($newsData=array())
  {
    $createTime = time();
    $funcFlag = $this->setFlag ? 1 : 0;
    $newTplHeader = "xml>
      ToUserName>![CDATA[{$this->msg->FromUserName}]]>/ToUserName>
      FromUserName>![CDATA[{$this->msg->ToUserName}]]>/FromUserName>
      CreateTime>{$createTime}/CreateTime>
      MsgType>![CDATA[news]]>/MsgType>
      ArticleCount>%s/ArticleCount>Articles>";
    $newTplItem = "item>
      Title>![CDATA[%s]]>/Title>
      Description>![CDATA[%s]]>/Description>
      PicUrl>![CDATA[%s]]>/PicUrl>
      Url>![CDATA[%s]]>/Url>
      /item>";
    $newTplFoot = "/Articles>
      FuncFlag>%s/FuncFlag>
      /xml>";
    $content = '';
    $itemsCount = count($newsData['items']);
    //微信公眾平臺圖文回復的消息一次最多10條
    $itemsCount = $itemsCount  10 ? $itemsCount : 10;
    if ($itemsCount) {
      foreach ($newsData['items'] as $key => $item) {
        if ($key=9) {
          $content .= sprintf($newTplItem,$item['title'],$item['description'],$item['picurl'],$item['url']);
        }
      }
    }
    $header = sprintf($newTplHeader,$itemsCount);
    $footer = sprintf($newTplFoot,$funcFlag);
    return $header . $content . $footer;
  }
 
  /**
   * reply 
   * 
   * @param mixed $data 
   * @access public
   * @return void
   */
  public function reply($data)
  {
    if ($this->debug) 
    {
      $this->log($data);
    }
    echo $data;
  }
 
  /**
   * checkSignature 
   * 
   * @access private
   * @return void
   */
  private function checkSignature()
  {
    $tmpArr = array($this->token, $this->timestamp, $this->nonce);
    sort($tmpArr);
    $tmpStr = implode( $tmpArr );
    $tmpStr = sha1( $tmpStr );
     
    if( $tmpStr == $this->signature ){
      return true;
    }else{
      return false;
    }
  }
 
  /**
   * log 
   * 
   * @access private
   * @return void
   */
  private function log($log)
  {
    if ($this->debug)
    {
      file_put_contents(Yii::getPathOfAlias('application').'/runtime/weixin_log.txt', var_export($log, true)."\n\r", FILE_APPEND);
    }
  }
}

/**
   * actionIndex 
   * 
   * @access public
   * @return void
   */
  public function actionIndex()
  {
    $weixin = new Weixin($_GET);
    $weixin->token = $this->_weixinToken;
    //$weixin->debug = true;
 
    //網址接入時使用
    if (isset($_GET['echostr']))
    {
      $weixin->valid();
    }
     
    $weixin->init();
    $reply = '';
    $msgType = empty($weixin->msg->MsgType) ? '' : strtolower($weixin->msg->MsgType);
    switch ($msgType)
    {
    case 'text':
      //你要處理文本消息代碼
      break;
    case 'image':
      //你要處理圖文消息代碼
      break;
    case 'location':
      //你要處理位置消息代碼
      break;
    case 'link':
      //你要處理鏈接消息代碼
      break;
    case 'event':
      //你要處理事件消息代碼
      break;
    default: 
      //無效消息情況下的處理方式
      break;
    }
    $weixin->reply($reply);
  }