Scott Reilly

This plugin provides two template tags for use in single.php to create a post navigation loop, whereby previous to the first post is the last post, and after the last post is first post. Basically, when you’re on the last post and you click to go to the next post, the link takes you to the first post. Likewise, if you’re on the first post and click to go to the previous post, the link takes you to the last post.
The function <code>c2c_next_or_loop_post_link()</code> is identical to WordPress’s <code>next_post_link()</code> in every way except when called on the last post in the navigation sequence, in which case it links back to the first post in the navigation sequence.
The function <code>c2c_previous_or_loop_post_link()</code> is identical to WordPress’s <code>previous_post_link()</code> in every way except when called on the first post in the navigation sequence, in which case it links back to the last post in the navigation sequence.
Useful for providing a looping link of posts, such as for a portfolio, or to continually present pertinent posts for visitors to continue reading.
If you are interested in getting the post itself and not just a link to the post, you can use the <code>c2c_get_next_or_loop_post()</code> and <code>c2c_get_previous_or_loop_post()</code> functions. If you just want the URL to the post, you can use <code>c2c_get_next_or_loop_post_url()</code> and <code>c2c_get_previous_or_loop_post_url()</code>.
Links: <a href="https://coffee2code.com/wp-plugins/loop-post-navigation-links/" rel="nofollow ugc">Plugin Homepage</a> | <a href="https://wordpress.org/plugins/loop-post-navigation-links/" rel="ugc">Plugin Directory Page</a> | <a href="https://github.com/coffee2code/loop-post-navigation-links/" rel="nofollow ugc">GitHub</a> | <a href="https://coffee2code.com" rel="nofollow ugc">Author Homepage</a>
<h3>Template Tags</h3>
The plugin provides four template tags for use in your single-post theme templates.
<h4>Functions</h4>
<ul>
<li>
<code>function c2c_next_or_loop_post_link( $format='%link &raquo;', $link='%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' )</code> 
Like WordPress’s <code>next_post_link()</code>, this function displays a link to the next chronological post (among all published posts, those in the same category, or those not in certain categories). Unlink <code>next_post_link()</code>, when on the last post in the sequence this function will link back to the first post in the sequence, creating a circular loop.
</li>
<li>
<code>function c2c_get_next_or_loop_post_link( $format='%link &raquo;', $link='%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' )</code> 
Like `c2c_next_or_loop_post_link(), but returns the value without echoing it.
</li>
<li>
<code>function c2c_previous_or_loop_post_link( $format='&laquo; %link', $link='%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' )</code> 
Like WordPress’s <code>previous_post_link()</code>, this function displays a link to the previous chronological post (among all published posts, those in the same category, or those not in certain categories). Unlink <code>previous_post_link()</code>, when on the first post in the sequence this function will link to the last post in the sequence, creating a circular loop.
</li>
<li>
<code>function c2c_get_previous_or_loop_post_link( $format='&laquo; %link', $link='%title', $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' )</code> 
Like `c2c_get_previous_or_loop_post_link(), but returns the value without echoing it.
</li>
<li>
<code>function c2c_get_next_or_loop_post( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' )</code> 
Like WordPress’s <code>get_adjacent_post()</code> when used to find the next post, except when on the last post in the sequence this function will return the first post in the sequence, creating a circular loop.
</li>
<li>
<code>function c2c_get_previous_or_loop_post( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' )</code> 
Like WordPress’s <code>get_adjacent_post()</code> when used to find the previous post, except when on the first post in the sequence this function will return the last post in the sequence, creating a circular loop.
</li>
<li>
<code>function c2c_get_next_or_loop_post_url( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' )</code> 
Returns the URL for the next post or the post at the beginning of the series.
</li>
<li>
<code>function c2c_get_previous_or_loop_post_url( $in_same_term = false, $excluded_terms = '', $taxonomy = 'category' )</code> 
Returns the URL for the previous post or the post at the end of the series.
</li>
</ul>
<h4>Arguments</h4>
<ul>
<li>
<code>$format</code> 
(optional) A percent-substitution string indicating the format of the entire output string. Use <code>%link</code> to represent the next/previous post being linked, or <code>%title</code> to represent the title of the next/previous post.
</li>
<li>
<code>$link</code> 
(optional) A percent-substitution string indicating the format of the link itself that gets created for the next/previous post. Use <code>%link</code> to represent the next/previous post being linked, or <code>%title</code> to represent the title of the next/previous post.
</li>
<li>
<code>$in_same_term</code> 
(optional) A boolean value (either true or false) indicating if the next/previous post should be in the current post’s same taxonomy term.
</li>
<li>
<code>$excluded_terms</code> 
(optional) An array or comma-separated string of category or term IDs to which posts cannot belong.
</li>
<li>
<code>$taxonomy</code> 
(optional) Taxonomy, if $in_same_term is true. Default ‘category’.
</li>
</ul>
<h3>Examples</h3>
<pre><code><div class="loop-navigation">
 <div class="alignleft"><?php c2c_previous_or_loop_post_link(); ?></div>
 <div class="alignright"><?php c2c_next_or_loop_post_link(); ?></div>
</div><h3>Hooks</h3>
</code></pre>
The plugin is further customizable via eleven hooks. Typically, code making use of hooks should ideally be put into a mu-plugin, a site-specific plugin (which is beyond the scope of this readme to explain), or in theme template files. Many of these filters are likely only of interest to advanced users able to code.
c2c_previous_or_loop_post_link_output, c2c_next_or_loop_post_link_output (filters)
The ‘c2c_previous_or_loop_post_link_output’ and ‘c2c_next_or_loop_post_link_output’ filters allow you to customize the link markup generated for previous and next looping links, respectively.
Arguments:
<ul>
<li>$format (string): Link anchor format.</li>
<li>$link (string): Link permalink format.</li>
<li>$in_same_term (bool): Optional. Whether link should be in a same taxonomy term. Default is false.</li>
<li>$excluded_terms (array|string): Optional. Array or comma-separated list of excluded term IDs. Default is ”.</li>
<li>$previous (bool): Optional. Whether to display link to previous or next post. Default is true.</li>
<li>$taxonomy (string): Optional. Taxonomy, if $in_same_term is true. Default ‘category’.</li>
<li>$adjacent (string): Whether the post is previous or next.</li>
</ul>
Example:
<pre><code> <?php
 // Prepend "Prev:" to previous link markup.
 function my_custom_previous_or_loop_link_output( $output, $format, $link, $post, $in_same_term, $excluded_terms, $taxonomy ) {
 return 'Prev: ' . $output;
 }
 add_filter( 'c2c_previous_or_loop_post_link_output', 'my_custom_previous_or_loop_link_output', 10, 4 );
 ?>
</code></pre>
c2c_previous_or_loop_post_link_get, c2c_next_or_loop_post_link_get (filters)
The ‘c2c_previous_or_loop_post_link_get’ and ‘c2c_next_or_loop_post_link_get’ filters allow you to customize the link markups generated for previous and next looping links, respectively, but in the non-echoing functions.
Arguments:
<ul>
<li>$output (string): The adjacent post link.</li>
<li>$format (string): Link anchor format.</li>
<li>$link (string): Link permalink format.</li>
<li>$post (WP_Post): The adjacent post.</li>
<li>$in_same_term (bool): Optional. Whether link should be in a same taxonomy term. Default is false.</li>
<li>$excluded_terms (array|string): Optional. Array or comma-separated list of excluded term IDs. Default is ”.</li>
<li>$previous (bool): Optional. Whether to display link to previous or next post. Default is true.</li>
<li>$taxonomy (string): Optional. Taxonomy, if $in_same_term is true. Default ‘category’.</li>
<li>$adjacent (string): Whether the post is previous or next.</li>
</ul>
c2c_previous_or_loop_post_link, c2c_next_or_loop_post_link, c2c_get_previous_or_loop_post_link, c2c_get_next_or_loop_post_link, c2c_get_adjacent_or_loop_post, c2c_get_previous_or_loop_post, c2c_get_previous_or_loop_post (actions)
The ‘c2c_previous_or_loop_post_link’ and ‘c2c_next_or_loop_post_link’ actions allow you to use an alternative approach to safely invoke <code>c2c_previous_or_loop_post_link()</code> and <code>c2c_next_or_loop_post_link()</code>, respectively, in such a way that if the plugin were deactivated or deleted, then your calls to the functions won’t cause errors in your site. The ‘c2c_get_previous_or_loop_post_link’ and ‘c2c_get_next_or_loop_post_link’ filters do the same for the non-echoing <code>c2c_previous_or_loop_post_link()</code> and <code>c2c_next_or_loop_post_link()</code>.
Arguments:
<ul>
<li>Same as for for <code>c2c_previous_or_loop_post_link()</code> and <code>c2c_next_or_loop_post_link()</code></li>
</ul>
Example:
Instead of:
<pre><code><?php c2c_previous_or_loop_post_link( '&laquo; %link' ); ?>
</code></pre>
Do:
<pre><code><?php do_action( 'c2c_previous_or_loop_post_link', '&laquo; %link' ); ?>
</code></pre>

Loop Post Navigation Links

Template tags (for use in single.php) to create post navigation loop (previous to first post is last post; next/after last post is first post).

ambrosite

IMPORTANT: Make sure you are using the right plugin.
<ul>
<li>Next/Previous Post Link Plus is intended for use in single post templates.</li>
<li>Next/Previous Page Link Plus is intended for use in page templates.</li>
</ul>
The two plugins have similar sounding, but different, function names. If you mistakenly install the wrong plugin, you will get a “call to undefined function” error. If you want to create next/previous links for your pages, please check out: 
https://wordpress.org/extend/plugins/ambrosite-nextprevious-page-link-plus/
IMPORTANT: This plugin is not compatible with PHP 4. If you try to install it on a host running PHP 4, you will get a parse error. WordPress has officially ended support for PHP 4 as of version 3.2, so you should upgrade to PHP 5.2 now. For those who cannot upgrade, you can download the alternate PHP 4 compatible version of the plugin. The only difference with the PHP 4 version is that the %category variable will not work with custom taxonomies. 
http://www.ambrosite.com/download/ambrosite-nextprevious-post-link-plus.php4.zip
This plugin creates two new template tags — next_post_link_plus and previous_post_link_plus — which are upgraded versions of the core WordPress next_post_link and previous_post_link template tags. The new tags include all of the functionality of the core tags, plus the following additional options:
<ul>
<li>Sort the next/previous post links on columns other than post_date (e.g. alphabetically).</li>
<li>Sort next/previous links on custom fields (both string and integer sorts are supported).</li>
<li>Full WordPress 3.3 compatibility, including support for custom post types, custom taxonomies, and post formats.</li>
<li>Loop around to the first post if there is no next post (and vice versa).</li>
<li>Retrieve the first/last post, rather than the previous/next post (for First|Previous|Next|Last navigation links).</li>
<li>Display post thumbnails alongside the links (WordPress 2.9 or higher).</li>
<li>Truncate the link titles to any length, and display custom text in the tooltip.</li>
<li>Display the title, date, author, category, and meta value of the next/previous links.</li>
<li>Specify a custom date format for the %date variable.</li>
<li>Restrict next/previous links to same category, taxonomy, format, author, custom field value, custom post ID list, or custom category list.</li>
<li>Exclude categories, custom taxonomies, post formats, or individual post IDs.</li>
<li>Three category exclusion methods for greater control over the navigation stream.</li>
<li>Return multiple next/previous links (e.g. the next N links, in an HTML list).</li>
<li>Return the ID, title, date, href attribute, or post object of the next/previous links, instead of echoing them to the screen.</li>
<li>Return false if no next/previous link is found, so themes may conditionally display alternate text.</li>
<li>Works with Post Types Order and other popular post reordering plugins.</li>
</ul>
Extensive documentation on configuring the plugin may be found here: 
http://www.ambrosite.com/plugins/next-previous-post-link-plus-for-wordpress

Ambrosite Next/Previous Post Link Plus

Has many options to customize as well.  Hasn't been update for a while, but still works perfectly with WP 4.5.3.



Excellent - does what it says.

Provides next/previous post link template tags that work the way you'd expect the built-in WP functions to work!



A beautiful thing

This plugin has saved me countless hours and does exactly what it needs to do with easy setup and lots of options. Love it.

Highly recommended

Upgrades the next/previous post link functions to reorder or loop adjacent post navigation links, display post thumbnails, and customize link format.

Loop Post Navigation Links vs Ambrosite Next/Previous Post Link Plus