谢谢 shubank .. 你的答案有效... 我唯一需要添加的是优先级高... 这是更新的代码... 可以也帮助别人:)

Thanks shubank .. your answer works... The only thing I need to add is priority high... Here is the updated code... May it help someone too :)

 $ch = curl_init("https://fcm.googleapis.com/fcm/send");

    //The device token.
    $token = ""; //token here

    //Title of the Notification.
    $title = "Carbon";

    //Body of the Notification.
    $body = "Bear island knows no king but the king in the north, whose name is stark.";

    //Creating the notification array.
    $notification = array('title' =>$title , 'text' => $body);

    //This array contains, the token and the notification. The 'to' attribute stores the token.
    $arrayToSend = array('to' => $token, 'notification' => $notification,'priority'=>'high');

    //Generating JSON encoded string form the above array.
    $json = json_encode($arrayToSend);
    //Setup headers:
    $headers = array();
    $headers[] = 'Content-Type: application/json';
    $headers[] = 'Authorization: key= $key'; // key here

    //Setup curl, add headers and post parameters.
    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
    curl_close($ch);
    return $response;