Google calendar api google日历监视通知获取nul

嗨，谷歌日历上有安装手表吗

$channelID = "my-caledar-".  date('His',  time()); 
$channel->setId($channelID);
$channel->setType('web_hook');
$channel->setAddress('xxxxx');

并在调用此方法后获取有效参数

当我在日历上创建/删除任何事件时，推送通知url将变为null

if($_POST){
$msg = json_encode($_POST);
pg_query($pg_conn, "INSERT INTO postdata(post_data) values ('$msg')");
} else {
  $result = pg_query($pg_conn, "SELECT * FROM postdata;");
}

---

$result get empty field

通知不会作为一个POST参数出现在url上，我们可以通过$\u服务器变量获得它，如下所示

$msg = json_encode(array('HTTP_X_GOOG_CHANNEL_ID' =>  $_SERVER['HTTP_X_GOOG_CHANNEL_ID'],
'HTTP_X_GOOG_CHANNEL_EXPIRATION' => $_SERVER['HTTP_X_GOOG_CHANNEL_EXPIRATION'],
'HTTP_X_GOOG_RESOURCE_STATE' => $_SERVER['HTTP_X_GOOG_RESOURCE_STATE'],
'HTTP_X_GOOG_MESSAGE_NUMBER' => $_SERVER['HTTP_X_GOOG_MESSAGE_NUMBER'],
'HTTP_X_GOOG_RESOURCE_ID' => $_SERVER['HTTP_X_GOOG_RESOURCE_ID'],
'HTTP_X_GOOG_RESOURCE_URI' => $_SERVER['HTTP_X_GOOG_RESOURCE_URI']
));