WordPress, 親ページと子ページを全部出力

<?php
function beginsprite_get_children($id) {
	global $wpdb;
	$sql = "SELECT * FROM $wpdb->posts WHERE (post_type = 'page' AND post_status = 'publish') AND post_parent = $id ORDER BY menu_order ASC";
	return $wpdb->get_results($sql);
}
function beginsprite_print_children($results) {
	foreach ($results as $row) :
		beginsprite_wp_query($row->ID);
	endforeach;
}
 
function beginsprite_wp_query($id) {
	$query = new WP_Query("page_id=".intval($id));
	while ($query->have_posts()) : $query->the_post();
?>
	<div class="paged paged-<?php the_ID(); ?>">
		<h3 class="paged-title paged-title-<?php the_ID(); ?>"><?php the_title() ?></h3>
		<div class="entry">
			<?php the_content(); ?>
		</div>
	</div>
 
<?php
		$result = beginsprite_get_children ($id);
		if ($result) beginsprite_print_children($result);
	endwhile;
}
?>

// $parent_id = $post->post_parent;
beginsprite_wp_query($parent_id);