firebase

<?php
function send_notification ($tokens, $message)
{
 $url = 'https://fcm.googleapis.com/fcm/send';

 $msg = array
 (
 'body' => "$message",
 'title' => "PUSH NOTIFICATION"
 );
 $fields = array
 (
 'registration_ids' => $tokens,
 'notification' => $msg
 );
 $headers = array(
 'Authorization:key = Your_AUTH_KEY_FIND_FROM_FIREBASE_CONSOLE',
 '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 ($ch, CURLOPT_SSL_VERIFYHOST, 0);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
 $result = curl_exec($ch);
 if ($result === FALSE) {
 die('Curl failed: ' . curl_error($ch));
 }
 curl_close($ch);
?>