fcm.php

<?php
class PushNotification {
    // function to send push notification
    function push_notification($user_device_tokens, $push_message, $title = "Demo Adventure") {
	$api_key_access = '********************'; // API KEY for push notification
	$headers = array('Authorization: key=' . $api_key_access, 'Content-Type: application/json');
	$msg = array(
		"title" => "Notification title",
		"body" => "Notification body",
		"sound" => "default",
		"click_action" => "FCM_PLUGIN_ACTIVITY",
		"icon" => "fcm_push_icon"
	);
	$temp = array(
	    "a" => "b",
		"b" => "c"
		
	);
	$fields = array(
	    'registration_ids' => $user_device_tokens,
	    'notification' => $msg,
            'data'  => $temp
	);
	//var_dump($fields);die;
	$ch = curl_init();
	curl_setopt($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;
    }
}

$pushObj = new PushNotification();
// Here is the array of extra parameters which we will receive on notification clicked/received
$device_tokens = array("evQ91cyEM1w:************************");
$push_message = "Testing of firebase push notification 8866319427 www";
$push_title = "";
$pushObj->push_notification($device_tokens, $push_message, $push_title);
?>