Question

get_page_children( int $page_id,  array $pages )

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

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description

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

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参数

$page_id

(int) (Required) Page ID.

$pages

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

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返回值

(array) List of page children.

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源代码

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;
}

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更新日志

Version	description
1.5.1	Introduced.

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相关函数

Used By

• wp-includes/post.php: get_pages()

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User Contributed Notes

1. Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note 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>';
   ?>
   

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.