控制器未显示（白色空白）

Question

I have framewor (is kinda like MVC), on controller i have home.php and login.php, first on home.php i must check if the session blank or not, if the session blank i redirect to login.php. This code home.php

<?php

class Home extends Controller {
    protected $userpassword;

    public function __construct(){
        if (is_logged() == false) {
            to_page('AAAA');
        } 
        $this->userpassword = $this->model('userpassword');
    }

    public function index(){

        is_header(); 
        $this->view('home',[]);
        is_footer(); 
    }

}

on login.php i just use empty blank. (nothing on it)

First time i'll do this on address 192.168.40.222/budget (this just simple). Well is work on first time, he redirect to home.php, but when it check the seesion blank and go to redirect to 192.168.40.222/budget/login there's nothing on it, if the login.php code is blank it should showing not found page or something error on website, but is blank. just empty white board on page. Did i something wrong with this frame work?? Here's libary setting :

<?php
$path = '/budget/';

define('SERVER_NAME', 'http://'.$_SERVER['SERVER_NAME'].$path);
define( 'SERVER_PUBLIC', SERVER_NAME.'public/');
define( 'SERVER_UPLOAD', SERVER_PUBLIC.'uploads/' );

define('SERVER_ASSETS',SERVER_PUBLIC.'assets/');
define('SERVER_VENDOR',SERVER_PUBLIC.'vendor/');


define('SERVER_ROOT', $_SERVER['DOCUMENT_ROOT'] );
define('SERVER_REQUIRED', SERVER_ROOT.'/app/views/' );
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

require_once 'lib_mysql.php';
require_once 'web_mysql.php';
require_once 'lib_sidebar.php';

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

session_start();

/********************* FUNCTION REQUIRED *****************************/
function is_header(){
    return require_once SERVER_REQUIRED.'header.php';
}

function is_navbar(){
    return require_once SERVER_REQUIRED.'navbar.php';
}

function is_sidebar(){
    return require_once SERVER_REQUIRED.'sidebar.php';
}

function is_offsidebar(){
    return require_once SERVER_REQUIRED.'offsidebar.php';
}

function is_footer(){
    return require_once SERVER_REQUIRED.'footer.php';
}

/****************************************/


function is_logged(){
    // username, company, sbu, department, level, permission
    if (isset($_SESSION['nik']) AND isset($_SESSION['fty']) AND isset($_SESSION['sbu']) AND isset($_SESSION['dept']) AND isset($_SESSION['level']) AND isset($_SESSION['perm']))
        return true;

    return false;
}

function is_logged2(){
    // username, company, sbu, department, level, permission
        //var_dump($_SESSION['nik']);
    if (isset($_SESSION['nik']) AND isset($_SESSION['name']))
        return true;

    return false;
}

function is_user($user){

    return ($user == $_SESSION['nik'])? true : false;
}

function is_company($company){
    return ($company == $_SESSION['fty'])? true : false;
}

function is_sbu($sbu){
    return ($sbu == $_SESSION['sbu'])? true : false;
}

function is_department($department){
    return ($department == $_SESSION['dept'])? true : false;
}

function is_level($level){

    return ($level == $_SESSION['level'])? true : false;
}

function is_permission($permission){
    return ($permission == $_SESSION['perm'])? true : false;
}

function is_group($group){

    return ($group == $_SESSION['group'])? true : false;
}

function is_admin(){
    if (isset($_SESSION['user']) === false OR isset($_SESSION['perm']) === false) {
        return false;
    }
    if($_SESSION['perm'] == 0){
        return true;
    } else {
        return false;
    }
}

// /********************* FUNCTION *****************************/

function info_page (){
    $data = [];
    $url = explode('/', $_GET['url']);
    $data['title'] = $url[0];
    // $data['page'] = $url[1];
    return $data;
}
function to_page($data){
    $page = '';
    if ($data != '') {
        $page = $data;
    }
    //var_dump(SERVER_NAME.$page);
    header('Location: '.SERVER_NAME.$page);
}

function logo(){
    echo '<img src="'.SERVER_ASSETS.'images/logo.png" alt="ERP PBT"/>';
}

function copyright(){
    echo'<div class="copyright">
        &copy; <span class="current-year"></span><span class="text-bold text-uppercase"> IT PBT</span>. <span>All rights reserved</span>
    </div>';
}

function is_title($main,$sub){
    echo '<section id="page-title" class="padding-top-15 padding-bottom-15">
                <div class="row">
                    <div class="col-sm-8">
                        <h1 class="mainTitle">'.$main.'</h1>
                        <span class="mainDescription">'.$sub.'</span>
                    </div>
                </div>
            </section>';
}

function create_log($logAction,$logId){
    $path = SERVER_ROOT.'/public/log/';
    $file_log = $path.'log_activity_'.date('Y_m_d').'.txt';

    $logTime = date('h:i:s_A');
    $logIP = $_SERVER["REMOTE_ADDR"];

    $logData = strtoupper($logTime.' '.$logIP.' '.$logAction.' '.$logId."
");

    if (!file_exists($file_log)) {
        $my_file = $file_log;
        $handle = fopen($my_file, 'w') or die('Cannot open file:  '.$my_file);
        $data = $logData;
        fwrite($handle, $data);
    } else {
        $my_file = $file_log;
        $handle = fopen($my_file, 'a') or die('Cannot open file:  '.$my_file);
        $data = $logData;
        fwrite($handle, $data);
    }
}

?>

Pls help me, i kinda stuck on this. And sorry my bad langaunge.

UPDATE, I try another solution and it's work, i'm setting ip address to name domain like buget.erp.co.id or something like that. But i'm still curious abaout this error, why use ip address not working at all, but when use name domian is working?? Is because setting apache or what?? :/