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I have a Page layout like this

Parent Page
- Sub page 1
-- sub sub 1
-- sub sub 2
-- sub sub 4
- Sub page 2
-- sub sub 1
-- sub sub 2
-- sub sub 4

I want to query every single child page, regardless of how deep I go. This is my query but it only returns direct children(sub page 1 and 2)

query_posts('post_type=page&order=ASC&orderby=menu_order&depth=4&post_parent='.$post->ID);

How can I do this?

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1  
The inner posts don't have a parent of $post->ID but instead on subpages you need to query again using that $post->ID as the parent. –  Kevin Langley Jr. Nov 8 '11 at 19:09

2 Answers 2

I'm pretty sure you can use get_pages (http://codex.wordpress.org/Function_Reference/get_pages) function to solve this. It has child_of parameter which does exactly what you wanted.

The only problem is that it returns posts and not set $wp_query, so you can't use it as loop, but you can always call setup_postdata and then use template tags as in normal posts loop.

<?php
    $mypages = get_pages( array( 'child_of' => <PARENT_PAGE_ID>) );
    foreach( $mypages as $page ):
?>
        <h2><a href="<?php echo get_page_link( $page->ID ); ?>"><?php echo apply_filters('the_title', $page->post_title); ?></a></h2>
        <div class="entry"><?php echo apply_filters( 'the_content', $page->post_content ); ?></div>
<?php endforeach; ?>
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try this

function wpse33151_getSubpages() {      
    global $post;

    $parents = get_post_ancestors($post->post_id);
    krsort($parents);
    $parents = array_merge(array(), $parents);

    if (is_home() || is_single()) {
        $id = get_option('page_for_posts');
        $parent = get_post_ancestors($id);
        $id = $parent[0];
    } elseif($parents) {
        $id = $parents[0];
    } else {
        $id = $post->ID;
    }

    $children = wp_list_pages('title_li=&child_of=' . $id . '&echo=0');
    $out = null;

    if ($children) {
        $out = '';
        $out .= '' . get_the_title($id) . '';
        $out .= '
    '; $out .= $children; $out .= '
'; $out .= ''; } return $out; }
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From which source did you paste this? $parents = array_merge(array(), $parents); is merging an array with an empty array. For what reason? Also: $out .= '' . get_the_title($id) . ''; places a function between 2 times nothing :) –  kaiser Feb 26 '12 at 17:06

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