WordPress at a glance
function is not described

parent_post_rel_link() WP 2.8.0

Deprecated from version 3.3.0. It is no longer supported and can be removed in future releases. It is recommended to replace this function with the same one.

Display relational link for parent item

No Hooks.

Return

null. Null. Nothing.

Usage

parent_post_rel_link( $title );
$title(string)
Link title format.
Default: '%title'

Changelog

Since 2.8.0 Introduced.
Deprecated 3.3.0

Code of parent_post_rel_link() WP 5.7

<?php
function parent_post_rel_link( $title = '%title' ) {
	_deprecated_function( __FUNCTION__, '3.3.0' );

	echo get_parent_post_rel_link($title);
}