get_page_children( int $page_id, array $pages )

Identify descendants of a given page ID in a list of page objects.


Description Description

Descendants are identified from the $pages array passed to the function. No database queries are performed.


Top ↑

Parameters Parameters

$page_id

(int) (Required) Page ID.

$pages

(array) (Required) List of page objects from which descendants should be identified.


Top ↑

Return Return

(array) List of page children.


Top ↑

More Information More Information

This function calls itself recursively.



Top ↑

Source Source

File: wp-includes/post.php

function get_page_children( $page_id, $pages ) {
	// Build a hash of ID -> children.
	$children = array();
	foreach ( (array) $pages as $page ) {
		$children[ intval( $page->post_parent ) ][] = $page;
	}

	$page_list = array();

	// Start the search by looking at immediate children.
	if ( isset( $children[ $page_id ] ) ) {
		// Always start at the end of the stack in order to preserve original `$pages` order.
		$to_look = array_reverse( $children[ $page_id ] );

		while ( $to_look ) {
			$p           = array_pop( $to_look );
			$page_list[] = $p;
			if ( isset( $children[ $p->ID ] ) ) {
				foreach ( array_reverse( $children[ $p->ID ] ) as $child ) {
					// Append to the `$to_look` stack to descend the tree.
					$to_look[] = $child;
				}
			}
		}
	}

	return $page_list;
}

Top ↑

Changelog Changelog

Changelog
Version Description
1.5.1 Introduced.

Top ↑

User Contributed Notes User Contributed Notes

  1. Skip to note 1 content
    Contributed by Mayeenul Islam

    In one of my Hierarchical Custom Post Type (locations) I did @bhlarsen’s method, and in some extent it’s returning false children. So I did it my way:

    ID;
    
    //Instead of calling and passing query parameter differently, we're doing it exclusively
    $all_locations = get_pages( array(
                            'post_type'         => 'locations', //here's my CPT
                            'post_status'       => array( 'publish', 'pending' ) //my custom choice
                        ) );
    
    //Using the function
    $inherited_locations = get_page_children( $location_parent_id, $all_locations );
    
    // echo what we get back from WP to the browser (@bhlarsen's part :) )
    echo '' . print_r( $inherited_locations, true ) . '';
    ?>
    

    It’s giving me the correct children.

  2. Skip to note 2 content
    Contributed by Codex

    Examples

    <?php
    // Set up the objects needed
    $my_wp_query = new WP_Query();
    $all_wp_pages = $my_wp_query->query(array('post_type' => 'page'));
    
    // Get the page as an Object
    $portfolio =  get_page_by_title('Portfolio');
    
    // Filter through all pages and find Portfolio's children
    $portfolio_children = get_page_children( $portfolio->ID, $all_wp_pages );
    
    // echo what we get back from WP to the browser
    echo '<pre>' . print_r( $portfolio_children, true ) . '</pre>';
    ?>
    

You must log in before being able to contribute a note or feedback.