$signature = $_GET["signature"];
 $timestamp = $_GET["timestamp"];
 $nonce = $_GET["nonce"];
 $echostr=$_GET["echostr"];

 $token = TOKEN;//这里改成你第一步操作时填写的token
 $tmpArr = array($token, $timestamp, $nonce);
 sort($tmpArr, SORT_STRING);
 $tmpStr = implode( $tmpArr );
 $tmpStr = sha1( $tmpStr );

 if ($tmpStr == $signature ) {
 return $echostr;
 } else {
 return false;
 }

<"signature"];
//$timestamp = $_GET["timestamp"];
//$nonce = $_GET["nonce"];
//$echostr=$_GET["echostr"];
//
//$token = TOKEN;//这里改成你第一步操作时填写的token
//$tmpArr = array($token, $timestamp, $nonce);
//sort($tmpArr, SORT_STRING);
//$tmpStr = implode( $tmpArr );
//$tmpStr = sha1( $tmpStr );
//
//if ($tmpStr == $signature ) {
// return $echostr;
//} else {
// return false;
//}
include_once './Xcxmsg.php';
$xcxmsg = new Xcxmsg();
$postStr = file_get_contents('php://input');
if (!$postStr)
 return false;
$postArr = json_decode($postStr, true);
if (!isset($postArr['MsgType']) || !isset($postArr['FromUserName']))
 return false;
$data = ["touser" => $postArr['FromUserName']];
$accessToken = $xcxmsg->getAccessToken();
$url = "https://api.weixin.qq.com/cgi-bin/message/custom/send" . $accessToken;
switch ($postArr['MsgType']) {
 case "text":
 //如用户发送的是文字信息，这里处理
 //回复图文链接，也可以回复别的类型，根据需要
 $data['msgtype'] = "link";
 $data['link'] = [
  "title" => "hello",
  "description" => "Is Really A Happy Day",
  "url" => "LINK_URL",//连接url
  "thumb_url" =>"THUMB_URL" //图片url
 ];
 $json = json_encode($data, JSON_UNESCAPED_UNICODE);
 $xcxmsg->curl($json, $url);
 break;
 case "image": //如用户发送图片消息，进入这里
 //服务端回复 图片，也可以回复别的类型，根据需要
 $data['msgtype'] = "image";
 $data['image'] = ['media_id' => 'media_id值']; // 执行 $xcxmsg->upload($accessToken)返回的 media_id
 $json = json_encode($data, JSON_UNESCAPED_UNICODE);
 $xcxmsg->curl($json, $url);
 case "miniprogrampage":
 //如用户发送小程序卡片，进入这里
 //这里服务端回复小卡片，也可以回复别的类型，根据需要
 $data['msgtype'] = "miniprogrampage";
 $data['miniprogrampage'] = [
  "title" => "title",
  "pagepath" => "pages/index/index",
  "thumb_media_id" => "media_id值"];// 执行 $xcxmsg->upload($accessToken)返回的 media_id
 $json = json_encode($data, JSON_UNESCAPED_UNICODE);
 $xcxmsg->curl($json, $url);
 break;
 case "event":
 //如用户进入会话事件
 //这里可以回复文本
 $data['msgtype'] = "text";
 $data['text'] = [
  "content" => "Hello World",
  ];
 $json = json_encode($data, JSON_UNESCAPED_UNICODE);
 $xcxmsg->curl($json, $url);
 break;
 default:
}

<button open-type="contact" >客服消息</button>