Cara Menambah Top Menu di Web Sekolah CI

Assalam,.. tambahan script ini pada bagian paling atas pada file "application/views/phpmu-sekolah/header.php"
<?php
echo "<div class='secondary-menu'>
<div class='wrapper'>
<ul>";
function main_menu_top() {
$ci = & get_instance();
$query = $ci->db->query("SELECT id_menu, nama_menu, link, id_parent FROM menu where aktif='Ya' AND position='Top' order by urutan");
$menu = array('items' => array(),'parents' => array());
foreach ($query->result() as $menus) {
    $menu['items'][$menus->id_menu] = $menus;
    $menu['parents'][$menus->id_parent][] = $menus->id_menu;
}
if ($menu) {
    $result = build_main_menu_top(0, $menu);
    return $result;
}else{
    return FALSE;
}
}
 
function build_main_menu_top($parent, $menu) {
$html = "";
if (isset($menu['parents'][$parent])) {
    $html .= "<ul>";
    foreach ($menu['parents'][$parent] as $itemId) {
        if (!isset($menu['parents'][$itemId])) {
            if(preg_match("/^http/", $menu['items'][$itemId]->link)) {
                $html .= "<li><a target='_BLANK' href='".$menu['items'][$itemId]->link."'>".$menu['items'][$itemId]->nama_menu."</a></li>";
            }else{
                $html .= "<li><a href='".base_url().''.$menu['items'][$itemId]->link."'>".$menu['items'][$itemId]->nama_menu."</a></li>";
            }
        }
        if (isset($menu['parents'][$itemId])) {
            if(preg_match("/^http/", $menu['items'][$itemId]->link)) {
                $html .= "<li><a target='_BLANK' href='".$menu['items'][$itemId]->link."'><span>".$menu['items'][$itemId]->nama_menu."</span></a>";
            }else{
                $html .= "<li><a href='".base_url().''.$menu['items'][$itemId]->link."'><span>".$menu['items'][$itemId]->nama_menu."</span></a>";
            }
            $html .= build_main_menu_top($itemId, $menu);
            $html .= "</li>";
        }
    }
    $html .= "</ul>";
}
return $html;
}
echo main_menu_top();
echo "</ul>
</div>
</div>

Assalam,.. kalo semua script di tambahkan di paling atas header.php malah jadi tertutup semua webnya kak