Wordpress show (grand)parent, child and grandchildren pages - php

Question

I have a brand page (as parent) with several products (children), product groups (also children) with products (grand children) as pages. I'm querying a lot which seems a bit ridiculous. Is there a better way to achieve this the following?
Brand (parent page)
Product (child page)
Product group (parent page)
Product (child page)
Product group (parent page)
Product (child)
Code I'm using to query the pages:
<?php
$args = array(
'cat' => 54,
'orderby' => 'menu_order',
'order' => 'ASC',
'hierarchical' => 1,
'post_parent' => $post->ID,
'parent' => -1,
'offset' => 0,
'post_type' => 'page',
'post_status' => 'publish'
);
// The Query
$the_query = new WP_Query( $args );
// The Loop
if ( $the_query->have_posts() ) {
while ( $the_query->have_posts() ) {
$the_query->the_post();
get_template_part( 'strips/card-product' );
}
} else {
// no posts found
}
/* Restore original Post Data */
wp_reset_postdata();
$args = array(
'category__not_in' => 54,
'order' => 'ASC',
'orderby' => 'menu_order',
'hierarchical' => 1,
'post_parent__in' => array($post->ID),
'parent' => -1,
'offset' => 0,
'post_type' => 'page',
'post_status' => 'publish'
);
// The Query
$the_query = new WP_Query( $args );
// The Loop
if ( $the_query->have_posts() ) {
while ( $the_query->have_posts() ) {
$the_query->the_post();
// INSIDE PRODUCT GROUP
if ( in_category('product-groep') ) {
$args = array(
'category__not_in' => 54,
'order' => 'ASC',
'orderby' => 'menu_order',
'hierarchical' => 1,
'post_parent' => get_the_id(),
'parent' => -1,
'offset' => 0,
'post_type' => 'page',
'post_status' => 'publish'
);
// The Query
$query1 = new WP_Query( $args );
// The Loop
while ( $query1->have_posts() ) {
$query1->the_post();
if ( in_category('product-groep') ) {
$args = array(
'category__not_in' => array(54,8),
'order' => 'ASC',
'orderby' => 'menu_order',
'hierarchical' => 1,
'post_parent' => get_the_id(),
'parent' => -1,
'offset' => 0,
'post_type' => 'page',
'post_status' => 'publish',
'post__not_in' => array(692)
);
// The Query
$query2 = new WP_Query( $args );
// The Loop
while ( $query2->have_posts() ) {
$query2->the_post();
get_template_part( 'strips/card-product' );
}
wp_reset_postdata();
} else
{
}
}
wp_reset_postdata();
// OUTSIDE PRODUCT GROUP
}
else {
}
?>
<!-- END LOOP 1 -->
<?
}
} else {
// no posts found
}
/* Restore original Post Data */
wp_reset_postdata();
?>

Answer 1

Use this WP function get_pages() and get_page_children()
function get_child_pages( $parent_page_ID ){
$all_pages = get_pages( array( 'post_type'=> 'page' ) );
$child_pages = get_page_children( $parent_page_ID, $all_pages );
if( !empty( $child_pages ) ){
$html .= '<ul>';
foreach ( $child_pages as $key => $child_page ) {
$html .= '<li>'.$child_page->post_title;
get_child_pages( $child_page->ID );
$html .= '</li>';
}
$html .= '</ul>';
}
return $html;
}
function list_pages(){
$html = '';
$parent_pages = get_pages( array( 'parent' => 0, 'post_type'=> 'page' ) );
$html.= '<ul>';
foreach ( $parent_pages as $parent_page ) {
$html .= '<li>'.$parent_page->post_title;
$html .= get_child_pages( $parent_page->ID );
$html .= '</li>';
}
$html.= '</ul>';
return $html;
}
add_shortcode( 'list_pages', 'list_pages' );