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<?php
class MY_Controller extends CI_Controller {
    public function __construct(){
        parent::__construct();
        //check your login login here then redirect to login screen if not logged in
    }
} 

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<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class MY_Controller extends CI_Controller {
	public function __construct()
	{
		 parent::__construct();
		 $this->load->library('session');
     //For example I have set logged_in = true in authentication on success
     //Checking whether userdata logged_in not set ... if true redirecting to login screen
		 if(!$this->session->has_userdata('logged_in') || !$this->session->logged_in){

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buildscript {
  dependencies {
    classpath 'com.google.gms:google-services:3.0.0'
  }
}

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// Add to the bottom of the file
apply plugin: 'com.google.gms.google-services'
//includes Firebase Analytics by default

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//Analytics
com.google.firebase:firebase-core:9.0.2
//Realtime Database
com.google.firebase:firebase-database:9.0.2
//Storage
com.google.firebase:firebase-storage:9.0.2
//Crash Reporting
com.google.firebase:firebase-crash:9.0.2
//Authentication
com.google.firebase:firebase-auth:9.0.2

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//Cloud Messaging / Notifications
compile 'com.google.firebase:firebase-messaging:9.0.2'

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<service
  android:name=".fcm.FcmMessageService">
    <intent-filter>
       <action android:name="com.google.firebase.MESSAGING_EVENT"/>
    </intent-filter>
</service>
<service
  android:name=".fcm.FcmInstanceIdService">
    <intent-filter>
      <action android:name="com.google.firebase.INSTANCE_ID_EVENT"/>

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public class FcmInstanceIdService extends FirebaseInstanceIdService {

    @Override
    public void onTokenRefresh() {
        String token = FirebaseInstanceId.getInstance().getToken();
        Log.d("TOKEN",token);
        sendFcmTokenToServer(token);
    }

    private void sendFcmTokenToServer(String token){

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public class FcmMessageService extends FirebaseMessagingService{
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        //onMessageReceived will be called when ever you receive new message from server.. (app in background and foreground )
        Log.d("FCM", "From: " + remoteMessage.getFrom());
        
        if(remoteMessage.getNotification()!=null){
        Log.d("FCM", "Notification Message Body: " + remoteMessage.getNotification().getBody());
        }
        

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<?php
/*  
Parameter Example
	$data = array('post_id'=>'12345','post_title'=>'A Blog post');
	$target = 'single tocken id or topic name';
	or
	$target = array('token1','token2','...'); // up to 1000 in one request
*/
public function sendMessage($data,$target){
//FCM api URL