-/**
- * Get boundary post relational link.
- *
- * Can either be start or end post relational link.
- *
- * @since 2.8.0
- *
- * @param string $title Optional. Link title format.
- * @param bool $in_same_cat Optional. Whether link should be in same category.
- * @param string $excluded_categories Optional. Excluded categories IDs.
- * @param bool $start Optional, default is true. Whether display link to first or last post.
- * @return string
- */
-function get_boundary_post_rel_link($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) )
- return;
-
- // 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 );
-}
-
-/**
- * Display relational link for the first post.
- *
- * @since 2.8.0
- *
- * @param string $title Optional. Link title format.
- * @param bool $in_same_cat Optional. Whether link should be in same category.
- * @param string $excluded_categories Optional. Excluded categories IDs.
- */
-function start_post_rel_link($title = '%title', $in_same_cat = false, $excluded_categories = '') {
- echo get_boundary_post_rel_link($title, $in_same_cat, $excluded_categories, true);
-}
-
-/**
- * Get site index relational link.
- *
- * @since 2.8.0
- *
- * @return string
- */
-function get_index_rel_link() {
- $link = "<link rel='index' title='" . esc_attr( get_bloginfo( 'name', 'display' ) ) . "' href='" . esc_url( user_trailingslashit( get_bloginfo( 'url', 'display' ) ) ) . "' />\n";
- return apply_filters( "index_rel_link", $link );
-}
-
-/**
- * Display relational link for the site index.
- *
- * @since 2.8.0
- */
-function index_rel_link() {
- echo get_index_rel_link();
-}
-
-/**
- * Get parent post relational link.
- *
- * @since 2.8.0
- *
- * @param string $title Optional. Link title format.
- * @return string
- */
-function get_parent_post_rel_link($title = '%title') {
- if ( ! empty( $GLOBALS['post'] ) && ! empty( $GLOBALS['post']->post_parent ) )
- $post = & get_post($GLOBALS['post']->post_parent);
-
- if ( empty($post) )
- return;
-
- $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 = "<link rel='up' title='";
- $link .= esc_attr( $title );
- $link .= "' href='" . get_permalink($post) . "' />\n";
-
- return apply_filters( "parent_post_rel_link", $link );
-}
-
-/**
- * Display relational link for parent item
- *
- * @since 2.8.0
- */
-function parent_post_rel_link($title = '%title') {
- echo get_parent_post_rel_link($title);
-}
-