如何在PHP中将Firebase Clould消息令牌发送到服务器/数据库

Question

我不知道我是否在寻找正确的地方，但是我一直在努力做到这一点。我想保存用户接受时发送给我的数据库的通知时发送的令牌，以便以后可以向他们发送消息，但很难弄清楚。设置的其他各个方面现在都对我有效，我可以向一个令牌ID发送通知。我的.js文件中有这个

 <script>
       MsgElem = document.getElementById("msg");
       TokenElem = document.getElementById("token");
       NotisElem = document.getElementById("notis");
       ErrElem = document.getElementById("err");


   const messaging = firebase.messaging();
 messaging
   .requestPermission()
   .then(function () {
     MsgElem.innerHTML = "Notification permission granted." 
     console.log("Notification permission granted.");

     // get the token in the form of promise
     return messaging.getToken()
   })
   .then(function(token) {
     // print the token on the HTML page
     TokenElem.innerHTML = "token is : " + token
   })
   .catch(function (err) {
   ErrElem.innerHTML = ErrElem.innerHTML + "; " + err
   console.log("Unable to get permission to notify.", err);
 });

     messaging.onMessage(function(payload) {
            console.log("Message received. ", payload);
            NotisElem.innerHTML = NotisElem.innerHTML + JSON.stringify(payload) 
        });
</script>

并从我拥有的服务器发送通知

$url = "https://fcm.googleapis.com/fcm/send";
    $token = "fgdfgf******************jjjjjbh";
    $serverKey = 'AAA*************************1-ZVHgN42oOwqD';
    $title = "Notification title";
    $body = "Hello I am from Your php server";
    $notification = array('title' =>$title , 'body' => $body, 'sound' => 'default', 'icon' => '/icon-128x128.png');
    $arrayToSend = array('to' => $token, 'notification' => $notification,'priority'=>'high');
    $json = json_encode($arrayToSend);
    $headers = array();
    $headers[] = 'Content-Type: application/json';
    $headers[] = 'Authorization: key='. $serverKey;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST,"POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
    curl_setopt($ch, CURLOPT_HTTPHEADER,$headers);
    //Send the request
    $response = curl_exec($ch);
    //Close request
    if ($response === FALSE) {
    die('FCM Send Error: ' . curl_error($ch));
    }
    curl_close($ch);

如何从php的js响应中获取令牌，以便将其保存在数据库中。