Chris A. a11n

<p>Backwards Compatible Permalinks helps prevent 404 errors when switching between permalink structures.</p>
<p>It achieves this by appending a set of backwards compatible post rewrite rules. This ensures posts are still accessible at their previous permalink after the permalink structure is updated.</p>
<h4>Example</h4>
<p>Let’s say your permalink structure is set to “Month and name” and you have a post titled “I Love WordPress.” That particular post would live at <code>https://example.com/2019/03/i-love-wordpress/</code>.</p>
<p>But what if you wanted to switch to the “Post name” permalink structure and have your post live at <code>https://example.com/i-love-wordpress/</code> instead?</p>
<p>You could but this would result in the existing post permalink 404ing when visited. Which is problematic if the previous URL was bookmarked or shared on social media.</p>
<p>With Backwards Compatible Permalinks installed your post would be accessible at both the old and new permalink structures:</p>
<ul>
<li><code>https://example.com/2019/03/i-love-wordpress/</code></li>
<li><code>https://example.com/i-love-wordpress/</code></li>
</ul>
<h4>Caveats</h4>
<ul>
<li>This plugin does not work retroactively. i.e. you must have the plugin installed and activated prior to switching permalink structures before backwards compatibility will work.</li>
<li>Currently only standard posts are supported.</li>
<li>Backwards compatibility is not supported between certain permalink structure updates. This is due to a clash between permalink structure regex matching.</li>
<li>Backwards compatibility is only provided between the most recent permalink structure update. i.e. you cannot change your permalink structure 3 times and have backwards compatibility across all 3 structures.</li>
</ul>
<h4>Deactivate or uninstall</h4>
<p>After deactivating or uninstalling this plugin please ensure you visit Settings > Permalinks in the WordPress admin area to flush your rewrite rules.</p>
<h4>Contributing</h4>
<p>Contributions are <a href="https://github.com/aprea/backwards-compatible-permalinks" rel="nofollow ugc">welcomed on GitHub</a>.</p>
<h3>From within WordPress</h3>
<ol>
<li>Visit ‘Plugins > Add New’.</li>
<li>Search for ‘Backwards Compatible Permalinks’.</li>
<li>Activate Backwards Compatible Permalinks from your Plugins page.</li>
</ol>
<h3>Manually</h3>
<ol>
<li>Upload the <code>backwards-compatible-permalinks</code> folder to the <code>/wp-content/plugins/</code> directory.</li>
<li>Activate the Backwards Compatible Permalinks plugin through the ‘Plugins’ menu in WordPress.</li>
</ol>


Backwards Compatible Permalinks

Provides a degree of backwards compatibility when switching between permalink structures.

Robert O'Rourke

interconnectit

<p>In addition to controlling your custom post type permalinks this plugin adds support for using custom taxonomies in your permalink structures as well.</p>
<p>Not only that but you can control the full permalink so the post type slug is not required at the start of the link.</p>
<p>Multiple post types can use the same permalink structure.</p>
<h4>Usage</h4>
<p>There are 2 ways to use this plugin:</p>
<p><strong>Permalink Settings</strong></p>
<p>The plugin adds fields to the permalinks settings page for any public facing custom post types.</p>
<p><strong>In Code</strong></p>
<p>When registering a post type you can add a value to the rewrite property with the key ‘permastruct’ to define your default permalink structure.</p>
<p>eg:</p>
<pre><code><?php

register_post_type( 'my_type', array(
    ...
    'rewrite' => array(
        'permastruct' => '/%custom_taxonomy_name%/%author%/%postname%/'
    ),
    ...
) );

?>
</code></pre>


WP Permastructure

Adds the ability to configure permalinks for custom post types using rewrite tags like %post_id% and %author%.

Backwards Compatible Permalinks vs WP Permastructure