Php FCM iOS Receive notification in background - php

Question

I am writing a general FCM function in PHP to send remote notifications to both Android and IOS devices.
In IOS I get notifications in the foreground but when App is in the background, I don't get any notification.
I tried several methods from the net and nothing helped me.
Kindly help me to set the server side properly
Try 1 :
$feildAryVar = array(
'content_available' => true,
'registration_ids' => $FcmUidVar,
'data' => array("MsgKey"=>json_encode($msgToSendVar)),
'notification' => array(
"title"=>"Fcm TtlMsg",
"body"=>"Fcm Dtl Msg",
"content_available"=> true)
);
Try 2 :
$feildAryVar = array(
'registration_ids' => $FcmUidVar,
'data' => array("MsgKey"=>json_encode($msgToSendVar)),
'notification' => array(
"title"=>"Fcm Title Msg",
"body"=>"Fcm Detail Msg",
"content_available"=> true)
);
Ios App Deligate :
func application(appPsgVar: UIApplication,
didReceiveRemoteNotification userInfo: [NSObject : AnyObject])
{
FIRMessaging.messaging().appDidReceiveMessage(userInfo)
}
func application(AppPsgVar: UIApplication,
didReceiveRemoteNotification userInfo: [NSObject : AnyObject],
fetchCompletionHandler handler: (UIBackgroundFetchResult) -> Void)
{
handler(UIBackgroundFetchResult.NewData)
FIRMessaging.messaging().appDidReceiveMessage(userInfo)
}
#available(iOS 10.0, *)
func userNotificationCenter(center: UNUserNotificationCenter, willPresentNotification notification: UNNotification, withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void)
{
print("userNotificationCenter : Forground")
completionHandler([.Alert,.Sound,.Badge])
}
#available(iOS 10.0, *)
func userNotificationCenter(center: UNUserNotificationCenter, didReceiveNotificationResponse response: UNNotificationResponse, withCompletionHandler completionHandler: () -> Void)
{
//Code Todo After User presess notification
}
func applicationReceivedRemoteMessage(remoteMessage: FIRMessagingRemoteMessage)
{
let fcmNfnVar = remoteMessage.appData
print("Received Notification : \(fcmNfnVar)")
}