Cara membatasi menu pada user

Assalamualaikum Warahmatullahi Wabarakatuh...
Mas, mau tanya pada bagian menu header.php di phpmu-magazine swarakalibata.
Cara agar user hanya bisa melihat menu sesuai dengan modul yang ditambahkan pada code dibawah.
 
function main_menu() {
	$ci = & get_instance();
    $query = $ci->db->query("SELECT id_menu, nama_menu, link, id_parent FROM menu where aktif='Ya' AND position='Bottom' 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(0, $menu);
        return $result;
    }else{
        return FALSE;
    }
}
 
function build_main_menu($parent, $menu) {
    $html = "";
    if (isset($menu['parents'][$parent])) {
    	if ($parent=='0'){
            $html .= "<ul class='the-menu'>
            			<li><a href='".base_url()."' style='background: url(".base_url()."asset/images/home.png) no-repeat center; font-size:0; width:34px;'><br></a></li>";
        }else{
        	$html .= "<ul>";
        }
        foreach ($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>";
                }
                $html .= build_main_menu($itemId, $menu);
                $html .= "</li>";
            }
        }
        $html .= "</ul>";
    }
    return $html;
}
echo main_menu();
 
Saya mau buat seperti di sidebar.php yang ada dihalaman administrator seperti dibawah ini.
 
$cek=$this->model_app->umenu_akses("main_menu",$this->session->id_session);
              if($cek==1 OR $this->session->level=='admin'){
}
 
Mohon pencerahannya. Terimakasih
Wassalamu'alakum Warahmatullahi Wabarakatuh