Keith S.

<p>The standard WordPress template tags used for post navigation (next_post, previous_post, next_post_link, and previous_post_link) don’t offer this functionality, leaving you with nothing returned if there isn’t a post.  This plugin changes that.</p>
<p>NOTE!!!  This plugin only works (without a hack in your template) on single post pages.</p>
<p>You can find the plugin home page (and leave comments) <a href="http://keithsolomon.net/plr/" rel="nofollow ugc">here</a>.</p>
<h3>Usage</h3>
<p>plr_[next|previous]_post_link(‘format’, ‘link’, ‘in_same_cat’, ‘excluded_categories’)</p>
<h3>Example</h3>
<p>This would show “Next Post Title →” as a link if there was a post that came after the currently-viewed post, or “next post:” as plain text if the current post is the most recent.</p>
<h3>Parameters</h3>
<p>This plugin uses the same parameters and format as the next_post and previous_post WordPress functions.  For more info on these functions, please visit the <a href="https://codex.wordpress.org/Template_Tags/next_post_link" rel="nofollow ugc">codex</a>.</p>


Post Links Redux

Display text instead of nothing if there isn't a next or previous post for the currently-displayed post.

IMPORTANT NOTES

>THIS PLUGIN IS NO  …

Amir Helzer

<p>This plugin will make sure that any link you enter to other posts or pages will always stay valid.<br />
When documents that you link to move, change slugs or even when the entire permlink structure changes completely, links will be correct.</p>
<p>It does so by replacing all internal links to their default link format (e.g. /?p=N or /?page_id=M).<br />
Then, when rendering, the default links are changed to the current permlink values.</p>
<h4>Supports</h4>
<ul>
<li>Posts</li>
<li>Pages</li>
<li>Categories</li>
</ul>
<h4>Fixing existing contents</h4>
<p>The plugin can scan existing contents (posts and pages). It will automatically convert all live links and would suggest how to fix links to pages that have moved.</p>
<h4>Reverting</h4>
<p>The plugin lets you return all links to their current permlink structure in the database, so if you choose to deactivate the plugin, things go back to the exact way they were.</p>
<h4>SitePress</h4>
<p>This plugin is part of <a href="http://sitepress.org" rel="nofollow ugc">SitePress</a> – a collection of plugins that turn WordPress into a fully featured multilingual content management system.</p>
<h3>Version History</h3>
<ul>
<li>Version 0.1
<ul>
<li>First public release.</li>
</ul>
</li>
<li>Version 0.2
<ul>
<li>Improved link replacement.</li>
<li>Improved suggestions for broken links.</li>
<li>Added absolute links for categories.</li>
</ul>
</li>
<li>Version 1.1
<ul>
<li>Supports PHP4, Works correctly if blog is installed in a directory and not in root</li>
</ul>
</li>
<li>Version 1.1.1
<ul>
<li>Became a part of <a href="http://sitepress.org" rel="nofollow ugc">SitePress</a></li>
</ul>
</li>
</ul>


Absolute Links

Prevents dead links between any post or page by guaranteeing that all links always point to the current addresses (permlinks).

Post Links Redux vs Absolute Links