simple menu wordpress

/**In Functions**/
function wp_get_menu_array($current_menu) {
    $array_menu = wp_get_nav_menu_items($current_menu);
    $menu = array();
    foreach ($array_menu as $m) {
        if (empty($m->menu_item_parent)) {
            $menu[$m->ID] = array();
            $menu[$m->ID]['ID'] = $m->ID;
            $menu[$m->ID]['title'] = $m->title;
            $menu[$m->ID]['url'] = $m->url;
            $menu[$m->ID]['children'] = array();
        }
    }
    $submenu = array();
    foreach ($array_menu as $m) {
        if ($m->menu_item_parent) {
            $submenu[$m->ID] = array();
            $submenu[$m->ID]['ID'] = $m->ID;
            $submenu[$m->ID]['title'] = $m->title;
            $submenu[$m->ID]['url'] = $m->url;
            $menu[$m->menu_item_parent]['children'][$m->ID] = $submenu[$m->ID];
        }
    }
    return $menu;
}



header:---
$a = wp_get_menu_array('main menu');