How to avoid multiple value in same form submission ?

is your dashboard really consuming post requests that seems like a login form?

anyway, always redirect after a POST request to avoid duplicate form submission. If you have to show a view, create a new show endpoint (with a separate GET request for it), then redirect to it from the POST.

note: and if that is your real secret key, i suggest to remove it from your post and change it

@s4muel Thanks for Your reply.

I got solution using Cache mechanism to filter the second Array elements for that I include

use Illuminate\Support\Facades\Cache; 

in LoginController and my function is as below

 public function dashboard(Request $request)
    {
        $user = $request->email;
        if (!Cache::has('user_' . $user)) {
        Cache::put('user_' . $user, true, 10);
        $keySecret = '6Ld63_wft2s5';
        $check = array(
            'secret'                =>        $keySecret,
            'response'                =>        $_POST['g-recaptcha-response']
        );

        $startProcess = curl_init();
        curl_setopt($startProcess, CURLOPT_URL, "https://www.google.com/recaptcha/api/siteverify");
        curl_setopt($startProcess, CURLOPT_POST, true);
        curl_setopt($startProcess, CURLOPT_POSTFIELDS, http_build_query($check));
        curl_setopt($startProcess, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($startProcess, CURLOPT_RETURNTRANSFER, true);
        $receiveData = curl_exec($startProcess); 
        $finalResponse = json_decode($receiveData, true); 
        if($finalResponse['success'])
        {
         $input = $request->all();
         $email = $request->email;
        $password = base64_encode($request->password);
        $adminData = AdminUserModel::where('email', $email)->where('password',MD5(base64_decode($password)))->where('status','1')->where('role','=','admin')->get()->count();  
        $operator = AdminUserModel::where('email', $email)->where('password',MD5(base64_decode($password)))->where('status','1')->where('role','=','operator')->get()->count();  
       
        if($adminData > 0 || $operator > 0)
        {
          
           $email = AdminUserModel::where('email', $email)->value('email');            
            $role = AdminUserModel::where('email', $email)->value('role');
           $loginId = AdminUserModel::where('email', $email)->value('id');
           Session::put('email', $email);
            Session::put('role', $role);
            Session::put('login_id', $loginId);
            Session::put('isAdminLoggedIn', 1);
            $totalapp = ApplicationModel::where('active','1')->count();
            $notificationYear = NotificationsModel::select('notification_year')
            ->where('notification_status','1')
            ->orderBy('notification_year','desc')->groupBy('notification_year')->get()->toArray();
            foreach($notificationYear as $key => $year)
            {
                $notifiData = NotificationsModel::where('notification_year',$year['notification_year'])->where('notification_status','1')->orderBy('created_at','desc')->get()->toArray(); 
                $notificationYear[$key]['notfn'] = $notifiData;
                foreach($notificationYear[$key]['notfn'] as $k => $nsp)
                {  
                        $p = DB::table('ksrtc_post')->select('post_name','id')
                        ->whereIn('id', json_decode($nsp['notification_post_id']))
                        ->get()->toArray();     
                            foreach($p as $pn)
                            {   
                                $post_count = ApplicationModel::where('notification_id',$nsp['id'])->where('active','1')->where('post_id',$pn->id)->orderBy('created_at','desc')->get()->count(); 
                                $pn->appln_count = $post_count;                            
                            }
                            $notificationYear[$key]['notfn'][$k]['posts'] = $p;
                          }
            }
            $currentYear = date("Y");
             return view('admin/Dashboard',['current_year' => $currentYear, 'total_app_count' => $totalapp, 'notifications' => $notificationYear, 'role' => $role, 'refresh' => true]);
                }
                     
        }
        else 
        { 
            return redirect()->back()->with(['failed' => 'Login Failed.']); 
                    
        }  
    } 
    header("Refresh: 0");  // To Refresh the page
    }

My Special thanks goes to Nandini .

Thanks

Anes P A