로그인화면을 메인페이지로 할수 있을까요?

if ($is_member == false) {
    //$subroot = '/subdir';
    $subroot = ''; 
    $allowed_urls = [ 
        $subroot . '/bbs/login.php',
        $subroot . '/bbs/login_check.php',
        $subroot . '/bbs/register.php',
        $subroot . '/bbs/register_form.php',
        $subroot . '/bbs/register_form_update.php',
        $subroot . '/plugin/kcaptcha/kcaptcha_image.php',
        $subroot . '/plugin/kcaptcha/kcaptcha_session.php',
        $subroot . '/plugin/kcaptcha/kcaptcha_mp3.php',
        $subroot . '/bbs/ajax.mb_id.php',
        $subroot . '/bbs/ajax.mb_nick.php',
        $subroot . '/bbs/ajax.mb_email.php',
    ];  

    if (in_array($_SERVER['PHP_SELF'], $allowed_urls) == false) {
        header('Location: ' . current($allowed_urls));
        exit();
    }   
}