getting parent page id when using custom menu.

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Im using custom menus to display a menu using wp_nav_menu(). I want to get the_content() of the parent in the menu, without setting it as a parent page in pages. Is there a way to get the parent id (in php). I can see that the wp_nav_menu gives the parent item a special class name, so i believe i should be able to retrieve that items id, and do something with it before the page loads. Is this possible?

Thanks!

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  1. Not sure if this is robust enough, but it shows basic traversal through menu to look for current post first then for its menu parent:

    /**
 * @param mixed $menu
 * @param int   $post_id
 *
 * @return WP_Post|bool
 */
function get_menu_parent( $menu, $post_id = null ) {

    $post_id        = $post_id ? : get_the_ID();
    $menu_items     = wp_get_nav_menu_items( $menu );
    $parent_item_id = wp_filter_object_list( $menu_items, array( 'object_id' => $post_id ), 'and', 'menu_item_parent' );

    if ( ! empty( $parent_item_id ) ) {
        $parent_item_id = array_shift( $parent_item_id );
        $parent_post_id = wp_filter_object_list( $menu_items, array( 'ID' => $parent_item_id ), 'and', 'object_id' );

        if ( ! empty( $parent_post_id ) ) {
            $parent_post_id = array_shift( $parent_post_id );

            return get_post( $parent_post_id );
        }
    }

    return false;
}