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function submenu_get_children_ids( $id, $items ) { $ids = wp_filter_object_list( $items, array( 'menu_item_parent' => $id ), 'and', 'object_id' ); foreach ( $ids as $id ) { $ids = array_merge( $ids, submenu_get_children_ids( $id, $items ) ); } return $ids; } $menu_name = 'primary-menu'; if ( ( $locations = get_nav_menu_locations() ) && isset( $locations[ $menu_name ] ) ) { $menu = wp_get_nav_menu_object( $locations[ $menu_name ] ); $menu_items = wp_get_nav_menu_items($menu->term_id); $parent_id = array_pop( wp_filter_object_list( $menu_items, array( 'classes' => array('filter_this') ), 'and', 'ID' ) ); $children = submenu_get_children_ids( $parent_id, $menu_items ); |