PHP微信公众号实现自动回复的功能

< ?php
$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
 
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...';
  }
}
?>