public static function login($userName, $pass)
 {
     $users = UserQuizFinal::all();
     $auth = new UserQuizFinal();
     $flag = false;
     foreach ($users as $user) {
         if ($user->userName == $userName && $user->userPass == $pass) {
             $flag = true;
             $isAdmin = $user->isAdmin;
             break;
         }
     }
     if ($flag == true) {
         //echo '<script type="text/javascript">alert("Login Succeed!"); </script>';
         echo '<script>app.controller(\'LoginForm\', function( $scope ) {$scope.loged=true;});</script>';
         echo '<script>window.location=\'http://localhost:69/QuizFinal/public/homepage\'</script>';
         return true;
     } else {
         echo '<script type="text/javascript">alert("Login Failed!")</script>';
         return false;
     }
 }
 public static function leaderBoard()
 {
     $users = UserQuizFinal::all();
     $userList = [];
     foreach ($users as $user) {
         array_push($userList, ['username' => $user->userName, 'userScore' => $user->userScore]);
     }
     return json_encode($userList);
 }