Send android push notifcation

FCM.php

<?php

// Server key from Google API's Console https://console.firebase.google.com/project/high-street-auctions/settings/cloudmessaging
define( 'SERVER_KEY', 'YOUR-API-ACCESS-KEY-GOES-HERE' );

$registrationIds = array('','','');

$payLoad = array
(
	'message' 	=> 'here is a message.',
	'title'		=> 'This is a title.',
	'subtitle'	=> 'This is a subtitle.',
	'tickerText'	=> 'Ticker text here',
	'vibrate'	=> 1,
	'sound'		=> 1,
	'largeIcon'	=> 'large_icon',
	'smallIcon'	=> 'small_icon'
);

$fields = array
(
	'registration_ids' 	=> $registrationIds,
	'data'			=> $payLoad
);
 
$headers = array
(
	'Authorization: key=' . SERVER_KEY,
	'Content-Type: application/json'
);
 
$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, 'https://android.googleapis.com/gcm/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;