php微信

<?php  $wechatObj = new wechatCallbackAPI();  $wechatObj->valid();   class wechatCallbackAPI {    private $token = "weixin";    private $appId = "开发者APPID";    private $appSecret = "APPSECRET";    private function checkSignature() {      $signature = $_GET["signature"];      $timestamp = $_GET["timestamp"];      $nonce = $_GET["nonce"];        $tmpArr = array($this->token, $timestamp, $nonce);      sort($tmpArr);      $tmpStr = implode($tmpArr);      $tmpStr = sha1($tmpStr);      if($tmpStr == $signature) {        return true;      } else {        return false;      }    }    public function valid() {      $echoStr = $_GET["echostr"];      //valid signature, option      if($this->checkSignature()){        echo $echoStr;        exit;      }    }  }?>

给token和appId 赋值后放到服务器中。然后在微信公众平台里填写服务器url点击提交。可能会失败几次，多点几次就好的。