如何获取父菜单项的子项？

Question

I have created a menu which have several items (WooCommerce categories), each of them having few child items (WooCommerce products).

I'm struggling to retrieve the sub items of a parent menu item.

Im getting the parent item using this code:

$the_menu       = wp_get_nav_menu_object('Some Menu');
$the_menu_items = wp_get_nav_menu_items($the_menu);

foreach ($the_menu_items as $index => $menu_item) {
    if ($menu_item->object_id == $category->term_id ) {
        $category_submenu = $menu_item;
    }
}

How can I retrieve the child items of current parent item?

Thank you in advance!

Answer 1

You need a recursion for all childs.

Here the example

if ( ! function_exists( 'recursive_mitems_to_array' ) ) {
    /**
     * @param $items
     * @param int $parent
     *
     * @return array
     */
    function recursive_mitems_to_array( $items, $parent = 0 )
    {
        $bundle = [];
        foreach ( $items as $item ) {
            if ( $item->menu_item_parent == $parent ) {
                $child               = recursive_mitems_to_array( $items, $item->ID );
                $bundle[ $item->ID ] = [
                    'item'   => $item,
                    'childs' => $child
                ];
            }
        }

        return $bundle;
    }
}

Usage:

$items = wp_get_nav_menu_items( "Default Theme Menu" ); // Your menu title
$build_tree = recursive_mitems_to_array( $items );

var_dump(build_tree);

Note: correct for your needs.

maybe you need to output html with values.

This example should return nested array (not fully tested)