Send FCM Push notification using PHP

index.php

<?php
/**
 * Send FCM Push notification using PHP
 */
$serverKey = '';
$deviceToken = '';
$notificationBody = array(
  'body' => 'here is a message. message',
  'title' => 'This is title #2',
  'sound' => "default",
  'color' => "#203E78"
);
$postData = array(
  'to' => $deviceToken,
  'priority' => 'high',
  'notification' => $notificationBody
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
  'Authorization: key=' . $serverKey,
  'Content-Type: application/json'
));
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
$result = curl_exec($ch);
curl_close($ch);

//RESULT
/*
{
  "multicast_id":5557136687835857624,
  "success":1,
  "failure":0,
  "canonical_ids":0,
  "results":[
     {
        "message_id":"0:1665487821688077%ccaea429ccaea429"
     }
  ]
}
*/