.dev/samples/admin_frameset/frameset.php
<?php
$GLOBALS['no_graphics'] = true;
include './index.php';
$qs = ( ! empty($_SERVER['QUERY_STRING']) ? '?' . $_SERVER['QUERY_STRING'] : '');
if (empty($_SESSION['admin_id'])) {
js_redirect('./' . $qs);
} else {
echo tpl()->parse('main_frameset', ['query_string' => $qs]);
}