public function send_FCM(){
// Method - 1
$fcmUrl = 'https://fcm.googleapis.com/v1/projects/anal.........719/messages:send';
$notification = array(
  "to"=>"/topic/cidade396",
  "notification"=>array(
    "body"=>"test 123"
  )
);
 $headers = [
    'Authorization: key=AIz.........9KWwy5BisxXYbA8',
    'Content-Type: application/json'
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$fcmUrl);
curl_setopt($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($notification));
$result = curl_exec($ch);
curl_close($ch);
var_dump($result);
return true;