echoz

This plugin provides functions to retrieve the parent category of any particular post should it be assigned to a sub category of that parent category.
Using this feature, the plugin is also able to modify the WordPress Loop to redirect any category page generation to the parent category. This is especially useful when theme developers want to be able to specify category-x.php templates and have all related posts, be it those assigned to the category or the sub categories use that template for page generation.
So for example the current category structure is as follows.
<ul>
<li>Main Category (has category-x.php template)
<ul>
<li>Sub Category 1</li>
<li>Sub Category 2</li>
</ul>
</li>
</ul>
A post is assigned to “Sub Category 2”.
When the post is requested the plugin will automatically detect if it has a parent category. If so, it will modify the WP variables to set the current category as the parent category and add a new variable stating the actual category of the post. This affects the WordPress Loop to category-x.php template defined for the parent
<h3>Usable Commands for Theme Developers</h3>
The PHP commands for theme developers to use are pretty straight forward.
get_category_child() returns the current post child category ID.
is_parent() checks if the current post is at the parent category.
get_category_title($id) gets the title of the category that is $id.
get_category_parent() returns the current post’s parent category ID.

Elevate Parent Category Template

Elevates parent category template to top of WordPress Loop.

Scott Reilly

This plugin provides a function for use by developers who have their own code for fetching posts according to a given criteria and now want to make use of loop-aware template tags to display those posts.
WordPress’s template tags are intended to be used within ‘the loop’. The loop is managed by a WP_Query object which sets up various global variables and its own object variables for use by the various template tags. The primary purpose of a WP_Query object is to actually query the database for the posts that match the currently specified criteria. However, if you don’t need to query for posts since you already have them by some other means, you can still take advantage of the template tags by injecting those posts into the WP_Query via this plugin.
Depending on the template tags you are looking to use, or the logic you are hoping to employ within a loop, you may need to manually configure some of the query object’s variables.
Example:
<pre><code><?php // Say we're in the sidebar

// We've gotten some post objects on our own.
$posts = c2c_get_random_posts( 5, '' );

// Inject the posts
c2c_inject_query_posts( $posts );

// Now let's display them via template tags:
if ( have_posts() ) :
 while ( have_posts() ) : the_post(); ?>

 <li><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></li>

 <?php endwhile;?>
<?php endif; ?>
</code></pre>
Links: <a href="https://coffee2code.com/wp-plugins/inject-query-posts/" rel="nofollow ugc">Plugin Homepage</a> | <a href="https://wordpress.org/plugins/inject-query-posts/" rel="ugc">Plugin Directory Page</a> | <a href="https://github.com/coffee2code/inject-query-posts/" rel="nofollow ugc">GitHub</a> | <a href="https://coffee2code.com" rel="nofollow ugc">Author Homepage</a>
<h3>Developer Documentation</h3>
Developer documentation can be found in <a href="https://github.com/coffee2code/inject-query-posts/blob/master/DEVELOPER-DOCS.md" rel="nofollow ugc">DEVELOPER-DOCS.md</a>. That documentation covers the template tag and hooks provided by the plugin.
As an overview, this is the template tag provided by the plugin:
<ul>
<li><code>c2c_inject_query_posts()</code> : Template tag to inject an array of posts into a query object as if that query object had obtained those posts via a query.</li>
</ul>
These are the hooks provided by the plugin:
<ul>
<li><code>inject_query_posts_preserve_query_obj</code> : Overrides the value of the <code>$preserve_query_obj</code> argument passed to the function. This is not typical usage for most users.</li>
<li><code>c2c_inject_query_posts</code> : Allows use of an alternative approach to safely invoke <code>c2c_inject_query_posts()</code> in such a way that if the plugin were deactivated or deleted, then your calls to the function won’t cause errors in your site.</li>
</ul>

Inject Query Posts

Facilitates injecting an array of posts into a WP query object as if queried. Particularly useful to allow use of standard template tags.

Elevate Parent Category Template vs Inject Query Posts