Get WordPress nav menu without markup containers

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<?php

/**
 * Get nav menu without markup containers
 *
 * @uses	wp_nav_menu()
 * @param	string $menu The name given to the menu in Appearance > Menus
 * @param	integer $depth
 * @return	string
 */
function pilau_menu_without_containers( $menu, $depth = 1 ) {
	$menu_items = wp_nav_menu( array(
		'menu'				=> $menu,
		'container'			=> '',
		'echo'				=> false,
		'depth'				=> $depth
	));
	// Strip ul wrapper
	$menu_items = trim( $menu_items );
	$menu_items = preg_replace( '#<ul[^>]*>#i', '', $menu_items, 1 );
	$menu_items = substr( $menu_items, 0, -5 );
	return $menu_items;
}