redirect - Php Header command working in one file but not working on other

hye ,
My current Directory structure is like

1. Admin (index.php, country.php)


2. Classes(connection.php,login.php,country.php)


3. header.php


4. footer.php


5. index.php


6. includes(header.php,footer.php)

my problem is that on webserver when i am in /admin/country.php and add a country using form post method and action set to /classes/country.php my header statement "Header("Location: ../Admin/country.php")" is working ok but when i am on my index page in root directory and try to login with form action "classes/login.php" and on successful login i use header("Location: ../Admin/index.php") it never redirects but everything works fine my local server, i don't know whats the problem over here, Any help would be really appreciated,

I have searched this forum and others and tried to use the techniques they have told but nothing is working

my index page index.php

my Admin Section Admin/Country.php

my login.php script is below

        ob_start();

        include_once("classes/connection.php");
?>




    class login
    {
        public static function validateLogin($userName,$password)

        {
            if(isset($userName) && isset($password))
            {
                $connection  = dbconnection::getConnection();
                $query = "Select * from tbllogin Where loginID ='" . $userName .
                "' and password = '" . $password . "'";

                $result = mysql_query($query);
                $rowsAffected =  mysql_affected_rows();


                if($rowsAffected==0)
                {

                        //header("Location: ../index.php/");
                        //exit();
                        return false;
                }
                else
                {


                    while($row = mysql_fetch_array($result))
                    {
                        //working

                        $role = $row["role"];
                        if($role == "Admin")
                        {

                            //header('Location: ../Admin/index.php');
                            //exit();

                            return true;
                        }
                        else
                        {
                            //echo "hello";
                            //header("Location: ../index.php/");
                            //exit();
                            return false;
                        }


                        //return $result;
                        //header("Location: ../index.php");

                    }
                }
            }
            else
            {
                //header("Location: ../index.php/");
                return false;

            }
        }
    }


?>




    if(isset($_POST["btnSumbit"]))
    {
        $isValid = login::validateLogin($_POST["userID"],$_POST["password"]);
        if(isset($isValid))
        {
            if($isValid ==true)
            {
                $host  = $_SERVER['HTTP_HOST'];
                $uri   = rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
                $extra = 'Admin/index.php';

                header("Location: http://$host$uri/$extra");
                exit();
            }
        }
    }

    ob_end_flush();

?>