WordPress at a glance
function is not described

prev_post_rel_link() WP 2.8.0

Displays the relational link for the previous post adjacent to the current post.

No Hooks.

Return

null. Nothing.

Usage

prev_post_rel_link( $title, $in_same_term, $excluded_terms, $taxonomy );
$title(string)
Link title format.
Default: '%title'
$in_same_term(true|false)
Whether link should be in a same taxonomy term.
Default: false
$excluded_terms(int[]|string)
Array or comma-separated list of excluded term IDs.
Default: true
$taxonomy(string)
Taxonomy, if $in_same_term is true.
Default: 'category'

Notes

Changelog

Since 2.8.0 Introduced.

Code of prev_post_rel_link() WP 5.7.2

<?php
function prev_post_rel_link( $title = '%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' ) {
	echo get_adjacent_post_rel_link( $title, $in_same_term, $excluded_terms, true, $taxonomy );
}