How to Send Message use Firebase Push Notification PHP MYSQL to All Tokens

I want to do it in such a way when I use {select token FROM devices} it selects all tokens and sends push notifications to all of them but when I do it notifications are sent 2x but to the first data token on database.

<form method="post" action="send_notification.php">
Title<input type="text" name="title">
Message<input type="text" name="message">
<!--Icon path<input type="text" name="icon">-->
Token<input type="text" name="token">
<input type="submit" name="submit" value="Send notification">
</form>
<?php
function sendNotification(){
include("../config/con.php");
$query = mysqli_query($conn,"SELECT token FROM devices");
$query_res = mysqli_fetch_array($query);
foreach ($query_res as $val) {
$registrationIds[]=$val;
}
$url ="https://fcm.googleapis.com/fcm/send";
$fields=array(
// "to"=>$_REQUEST['token'],
"registration_ids"=>$registrationIds,
"notification"=>array(
"body"=>$_REQUEST['message'],
"title"=>$_REQUEST['title'],
// "icon"=>$_REQUEST['icon'],
"click_action"=>"https://google.com/"
)
);
$headers=array(
'Authorization: key=key',
'Content-Type:application/json'
);
$ch=curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_POST,true);
curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_POSTFIELDS,json_encode($fields));
$result=curl_exec($ch);
print_r($result);
curl_close($ch);
}
if (isset($_POST['submit'])){
sendNotification();
}

you can solve it by trying this method:

Looping through the result set and retrieving all the tokens. Here's an updated snippet of the code:

// Retrieve all tokens from the database
$query_res = mysqli_query($conn, "SELECT token FROM devices");
$registrationIds = [];
// Iterate over each row and collect the tokens
while ($row = mysqli_fetch_assoc($query_res)) {
$registrationIds[] = $row['token'];
}

In the revised code snippet, we have used mysqli_fetch_assoc() to fetch each row as an associative array. By employing a while loop, we can iterate over all the rows in the result set and extract the token value from each row. These token values are then added to the $registrationIds array.

This approach ensures that you have all the tokens from the database stored in the $registrationIds array. Consequently, the push notification will be sent to each token without any duplication.

Correct me if im wrong