get_post_ancestors() WP 1.0

Retrieve ancestors of a post.

No Hooks.

Return

Int[]. Ancestor IDs or empty array if none are found.

Usage

get_post_ancestors( $post );

$post(int/WP_Post) (required)

Post ID or post object.

Changelog

Code of get post ancestors: wp-includes/post.php ^{WP 5.4.2}

<?php
function get_post_ancestors( $post ) {
	$post = get_post( $post );

	if ( ! $post || empty( $post->post_parent ) || $post->post_parent == $post->ID ) {
		return array();
	}

	$ancestors = array();

	$id          = $post->post_parent;
	$ancestors[] = $id;

	while ( $ancestor = get_post( $id ) ) {
		// Loop detection: If the ancestor has been seen before, break.
		if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors ) ) {
			break;
		}

		$id          = $ancestor->post_parent;
		$ancestors[] = $id;
	}

	return $ancestors;
}

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