Orders the pages with children under parents in a flat list.

Description

It uses auxiliary structure to hold parent-children relationships and runs in O(N) complexity

Parameters

$pagesWP_Post[]required

Posts array (passed by reference).

$page_idintoptional

Parent page ID. Default 0.

Return

Source

function get_page_hierarchy( &$pages, $page_id = 0 ) {
	if ( empty( $pages ) ) {
		return array();
	}

	$children = array();
	foreach ( (array) $pages as $p ) {
		$parent_id                = (int) $p->post_parent;
		$children[ $parent_id ][] = $p;
	}

	$result = array();
	_page_traverse_name( $page_id, $children, $result );

	return $result;
}

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