bp_core_menu_highlight_parent_page( array $retval, WP_Post $page )

function bp_core_menu_highlight_parent_page( $retval, $page ) {
	if ( ! is_buddypress() ) {
		return $retval;
	}

	$page_id = false;

	// Loop against all BP component pages.
	foreach ( (array) buddypress()->pages as $component => $bp_page ) {
		// Handles the majority of components.
		if ( bp_is_current_component( $component ) ) {
			$page_id = (int) $bp_page->id;
		}

		// Stop if not on a user page.
		if ( ! bp_is_user() && ! empty( $page_id ) ) {
			break;
		}

		// Members component requires an explicit check due to overlapping components.
		if ( bp_is_user() && 'members' === $component ) {
			$page_id = (int) $bp_page->id;
			break;
		}
	}

	// Duplicate some logic from Walker_Page::start_el() to highlight menu items.
	if ( ! empty( $page_id ) ) {
		$_bp_page = get_post( $page_id );
		if ( isset( $page->ID ) && in_array( $page->ID, $_bp_page->ancestors, true ) ) {
			$retval[] = 'current_page_ancestor';
		}
		if ( isset( $page->ID ) && $page->ID === $page_id ) {
			$retval[] = 'current_page_item';
		} elseif ( isset( $page->ID ) && $_bp_page && $page->ID === $_bp_page->post_parent ) {
			$retval[] = 'current-menu-item';
			$retval[] = 'current_page_parent';
		}
	}

	$retval = array_unique( $retval );

	return $retval;
}