Добавить новое уведомление при получении push-уведомления и заменить старое

<?php
// API access key from Google API's Console
function sendNotification($token,$message){
$url = 'https://android.googleapis.com/gcm/send';
$msg = array
(
'body' 	=> 'T...thoihgcggc',
'title'	=> 'Dexter Studio 123',
'subtitle'=> 'This is a subtitle. subtitle',
'tickerText'=> 'Ticker text here...Ticker text here...Ticker text here',
'vibrate'=>1,
'sound'=>'default',
'tag'=>'hellesjhasvhd',
'badge'=>0,
'ID'=>12,

);
$fields = array(
'registration_ids' => $token, // HERE IT IS
'data' => $msg
);

define("GOOGLE_API_KEY", "Apikey");
$headers = array(
'Authorization: key='. GOOGLE_API_KEY,
'Content-Type: application/json'
);
//print_r($headers);

$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send' );
curl_setopt( $ch,CURLOPT_POST, true );
curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );
$result = curl_exec($ch );
echo $result;
curl_close( $ch );
}


$conn = mysqli_connect("hostname","usrname","password","db");
$query = "SELECT * from tbltoken";
$token = array();
$results = mysqli_query($conn,$query);

if(mysqli_num_rows($results)>0 ){
while($row = mysqli_fetch_assoc($results)){
$token[] = $row["Token"];
}
}
//print_r($token);

mysqli_close($conn);

$message = array("message" => "FCM push notification" );
$message_status = sendNotification($token,$message);
echo $message_status;