function get_boundary_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '', $start = true) {}

Get boundary post relational link.
Can either be start or end post relational link.


  • string $title: Optional. Link title format.
  • bool $in_same_cat: Optional. Whether link should be in same category.
  • string $excluded_categories: Optional. Excluded categories IDs.
  • bool $start: Optional, default is true. Whether display link to first or last post.

Defined filters

  • the_title
    apply_filters('the_title', $title, $post->ID)
  • {$boundary}_post_rel_link
    apply_filters( "{$boundary}_post_rel_link", $link )

Source code

function get_boundary_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '', $start = true) {

	$posts = get_boundary_post($in_same_cat, $excluded_categories, $start);

	// If there is no post stop.

	if ( empty($posts) )


	// Even though we limited get_posts to return only 1 item it still returns an array of objects.

	$post = $posts[0];

	if ( empty($post->post_title) )

		$post->post_title = $start ? __('First Post') : __('Last Post');

	$date = mysql2date(get_option('date_format'), $post->post_date);

	$title = str_replace('%title', $post->post_title, $title);

	$title = str_replace('%date', $date, $title);

	$title = apply_filters('the_title', $title, $post->ID);

	$link = $start ? "<link rel='start' title='" : "<link rel='end' title='";

	$link .= esc_attr($title);

	$link .= "' href='" . get_permalink($post) . "' />\n";

	$boundary = $start ? 'start' : 'end';

	return apply_filters( "{$boundary}_post_rel_link", $link );


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