wp-includes/post.php:6249Identifies descendants of a given page ID in a list of page objects.
$page_idint$pagesWP_Post[]WP_Post[]function get_page_children( $page_id, $pages ) { // Build a hash of ID -> children. $children = array(); foreach ( (array) $pages as $page ) { $children[ (int) $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;}Introduced in 1.5.1. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/post.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.