Wie zum senden von push-Benachrichtigungen an mehrere Geräte über php-Skript mit FCM?

Ich bin neu push-Benachrichtigungen mit FCM von php auf Android-Geräte. Von der android-Seite habe ich generiert FCM-reg_id & senden Sie es über php-Skript & speichern in mysql-Datenbank. Nun, ich möchte, um Benachrichtigungen von php-Skript, um mehrere android-Geräte gleichzeitig.

Hier ist die php-Skripte, die verwendet werden, während das senden von push-Benachrichtigungen :

1.firebase.php (Referenz-link)

 <?php

class Firebase {

//sending push message to single user by firebase reg id
public function send($to, $message) {
    $fields = array(
        'to' => $to,
        'data' => $message,
    );
    return $this->sendPushNotification($fields);
}

//sending push message to multiple users by firebase registration ids
public function sendMultiple($registration_ids, $message) {
    $fields = array(
        'registration_ids' => $registration_ids,
        'data' => $message,
    );

    return $this->sendPushNotification($fields);
}

//function makes curl request to firebase servers
private function sendPushNotification($fields) {

    require_once('config.php');

    //Set POST variables
    $url = 'https://fcm.googleapis.com/fcm/send';

    $headers = array(
        'Authorization: key=' . FIREBASE_API_KEY,
        'Content-Type: application/json'
    );
    //Open connection
    $ch = curl_init();

    //Set the url, number of POST vars, POST data
    curl_setopt($ch, CURLOPT_URL, $url);

    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    //Disabling SSL Certificate support temporarly
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));

    //Execute post
    $result = curl_exec($ch);
    //echo "Result".$result;
    if ($result === FALSE) {
        die('Curl failed: ' . curl_error($ch));
    }

    //Close connection
    curl_close($ch);

    return $result;
   }
 }

?>

2.push.php : (Referenz-link)

<?php

class Push {

//push message title
private $title;
private $message;
private $image;
//push message payload
private $data;
//flag indicating whether to show the push
//notification or not
//this flag will be useful when perform some opertation
//in background when push is recevied
private $is_background;

function __construct() {

}

public function setTitle($title) {
    $this->title = $title;
}

public function setMessage($message) {
    $this->message = $message;
}

public function setImage($imageUrl) {
    $this->image = $imageUrl;
}

public function setPayload($data) {
    $this->data = $data;
}

public function setIsBackground($is_background) {
    $this->is_background = $is_background;
}

public function getPush() {
    $res = array();
    $res['data']['title'] = $this->title;
    $res['data']['is_background'] = $this->is_background;
    $res['data']['message'] = $this->message;
    $res['data']['timestamp'] = date('Y-m-d G:i:s');
    return $res;
}

}

3.test.php

 <?php
include_once('config.php');
require_once('DB_Functions.php');
require_once('firebase.php');
require_once('push.php');



$db = new DB_Functions();
$firebase = new Firebase();
$push = new Push();

if(isset($_POST['send']))
{
    //$sendvalue = $_POST['send'];
        ChromePhp::log('send it '.$_POST['send']." user 
category:".$_POST['user_category']." Title : ".$_POST['message_title']." Message : ".$_POST['message_to_send']);

        $ucategory = $_POST['user_category'];
        ChromePhp::log('U category '.$ucategory);

        //notification title
        $messageTitle = isset($_POST['message_title']) ? $_POST['message_title'] : '';

        //notification message
        $messageToSend = isset($_POST['message_to_send']) ? $_POST['message_to_send'] : '';
        ChromePhp::log('Message Title '.$messageTitle." Message:".$messageToSend);

        $userslist_with_fcm_id = $db->getUsersFCMId($ucategory);
        ChromePhp::log('FCM LIST  '.$userslist_with_fcm_id->num_rows);
        //var_dump($userslist_with_fcm_id);


        $push->setTitle($messageTitle);
        $push->setMessage($messageToSend);

        $push->setIsBackground(FALSE);

        $json = '';
        $response = '';

        if ($userslist_with_fcm_id->num_rows > 0) {
             while ($row = mysqli_fetch_array($userslist_with_fcm_id)){

             ChromePhp::log('FCM ID  '.$row['fcm_id']);

             $json = $push->getPush();

             $regId = $row['fcm_id'];
             $response = $firebase->send($regId, $json);
                                            }
                                        }

       else{
              echo '<h3>Oops ! You got empty data</h3>';
           }
        var_dump($response);       
}

?>


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            word-wrap: break-word; 
            width:100%; overflow-x:auto;
        }

    </style>

    <script type="text/javascript">



    function sendMessage()
    {
        //alert("method called");
        var chx = document.getElementsByTagName('input');

        for (var i=0; i<chx.length; i++) 
        {
                //If you have more than one radio group, also check the name attribute
                //for the one you want as in && chx[i].name == 'choose'
                //Return true from the function on first match of a checked item
                if (chx[i].type == 'radio' && chx[i].checked) 
                {
                    //alert("checked: "+chx[i].value);
                    $.ajax({
                            url: 'test.php',
                            type: 'post',
                            data: {
                                send:"true",
                                user_category :chx[i].value,
                                message_title : document.getElementById('title').value,
                                message_to_send : document.getElementById('message').value
                                  },
                            success: function(data, textStatus, jqXHR)
                                {
                                    //data - response from server
                                    //alert("success  :".textStatus);
                                },
                                error: function (jqXHR, textStatus, errorThrown)
                                {
                                    //alert("failed :".textStatus);
                                }   
                        });

                }


    }
}
</script>

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    <div class="header">
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                 <h1><a href="index.php">Admin Panel</a></h1>
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                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">My Account <b class="caret"></b></a>
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                            <li><a href="updateProfile.php">Update Profile</a></li>
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    <div class="row">
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                <li><a href="index.php"><i class="glyphicon glyphicon-tasks"></i>App Users</a></li>
                <li><a href="halt_sponsors_senate.php"><i class="glyphicon glyphicon-tasks"></i>Senate HALT Supporters</a></li>
                <li><a href="halt_sponsors_assembly.php"><i class="glyphicon glyphicon-tasks"></i>Assembly HALT Supporters</a></li>
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                <div class="col-md-12">
                    <div class="content-box-large">
                        <div class="panel-body">


                            <form class="pure-form pure-form-stacked" method="POST">
                                <fieldset>
                                    <legend>Create Message</legend>

                                    <label for="title">Title</label>
                                    <input type="text" value="Support Halt" id="title" name="title" class="pure-input-1-2" placeholder="Enter title">

                                    <label for="message">Message</label>
                                    <textarea class="pure-input-1-2" name="message" id="message" placeholder="Notification message!" rows="5" >Hello World</textarea>

                                    <br>
                                       <h5> 
                                        <input type="radio" id="user_category" name="user_category" value="userswithopponents"> Users with opponents<br>
                                        <br>
                                        <input type="radio" id="user_category" name="user_category" value="userswithsupporters"> Users with supporters<br>
                                        <br>
                                        <input type="radio" id="user_category" name="user_category" value="everyone"> Everyone <br>                                            
                                        <br>
                                        <input type="radio" id="user_category" name="user_category" value="nyresidentsonly"> NY residents only </h5>

                                </br>


                                    <input type="hidden" name="push_type" value="individual"/>
                                    <button type="submit" class="btn btn-primary" onclick="sendMessage()">Send</button>
                                </fieldset>
                            </form>
                        </div>

                    </div>
                </div>
            </div>
      </div>


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</div>



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So, jetzt habe ich versucht zu iterieren über alle reg_ids von Datenbank - & call send-Methode, aber es hat nicht das senden von Benachrichtigungen auf allen Geräten .