function login_user(){

    if(isset($_POST['submit'])){

        $username = escape_string($_POST['username']);
        $password = escape_string($_POST['password']);

        $query = query("SELECT * FROM users WHERE username = '{$username}' AND password = '{password}' ");
        confirm($query);


        if(mysqli_num_rows($query) == 0) {
            set_message("Your Password or Username are wrong");
            redirect("login.php");


        } else {
            set_message("Welcome to Admin {$username}  ");
            redirect("admin/");

        }





    }



}