fcm.php

<?php
define('API_ACCESS_KEY', 'AIzaSyA18itgZWVpD0zJ9ynRFHkVlpEIVRhzQGw');
$to = 'dZ0oX5R8nU4:APA91bHDLDsBZk7P76bRqNkiwWEhksd58QywCy2c0v-8HPuuwLN4SHdkFE5CMmgk5N-kzvGzWvxUafAlgDVnNagc9ZJf0BAxrdhmbScbsYojEEg5T750FPfne6VkA0rkD3Ix8jJbwtON';
$notification = array
(
    'body'      => 'here is a message. message',
    'title'     => 'This is a title. title',
    'sound'     => 1
);
$data = array
(
    'param1'    => 'val1',
    'param2'    => 'val2',
    'param3'    => 'val3'
);
$fields = array
(
    'to'            => $to,
    'data'          => $data,
    'priority'      => 'normal',
    'notification'  => $notification
);
 
$headers = array
(
    'Authorization: key=' . API_ACCESS_KEY,
    'Content-Type: application/json'
);
 
$ch = curl_init();
curl_setopt($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);
curl_close($ch);
echo $result;