get_post_ancestors( int|WP_Post $post )

Retrieve ancestors of a post.


Description


Parameters

$post

(int|WP_Post) (Required) Post ID or post object.


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Return

(array) Ancestor IDs or empty array if none are found.


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Source

File: wp-includes/post.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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Changelog

Version Description
2.5.0 Introduced.