Display subcategories of custom categories - WordPress - wordpress

Question

This is what I have:
$args = array(
'type' => 'post',
'child_of' => 0,
'parent' => '',
'orderby' => 'name',
'order' => 'ASC',
'hide_empty' => 1,
'hierarchical' => 1,
'exclude' => '',
'include' => '',
'number' => '',
'taxonomy' => 'directory-category',
'pad_counts' => false
);
Which gets me the categories.
What I want is to get the child categories of this directory-category taxonomy.
Any ideas on how to do that?
I'm not asking for a solution, just an advice or someone to show me the road.
Googling didn't help :/
Here is a screenshot HERE

Answer 1

You said you didn't want a direct answer, but essentially you want to use get_terms found here:
https://developer.wordpress.org/reference/functions/get_terms/
SELECT * from prod_term_taxonomy WHERE parent = 0;
UPDATE:
// Using your specific parent taxonomy id of 214 the query is below
global $wpdb;
$results = $wpdb->get_results("SELECT * from prod_term_taxonomy WHERE taxonomy = 'directory-category'");
// then you can use WordPress get_term to query each object to get it's name based on it's term_id. $results will be an array of objects so you will use a foreach loop to loop through to get each $result like this...
$child_cat_array = array();
foreach ($results as $result) {
$term = get_term( $result->term_id, $taxonomy );
$name = $term->name;
// the slug will be used for querying for posts
$slug = $term->slug;
// this will push the slug of the child category into the array for querying posts later
array_push($child_cat_array, $slug);
}
You can then modify your get_posts query like this:
$args = array(
'tax_query' => array(
array(
'taxonomy' => 'directory-category',
'field' => 'slug',
'terms' => $child_cat_array
)
)
);
$postslist = get_posts( $args );

Answer 2

If you want to display a list of Subcategories and the related posts based on a single category provided by you, you can use the following code. Make sure to use your own names of taxonomy, post_type and terms:
function ow_subcategories_with_posts_by_category( $taxonomy, $post_type, $term ) {
$category = get_term_by( 'slug', $term, $taxonomy );
$cat_id = $category->term_id;
// Get all subcategories related to the provided $category ($term)
$subcategories = get_terms(
array(
'taxonomy' => $taxonomy,
'parent' => $cat_id,
'orderby' => 'term_id',
'hide_empty' => true
)
);
?>
<div>
<?php
// Iterate through all subcategories to display each individual subcategory
foreach ( $subcategories as $subcategory ) {
$subcat_name = $subcategory->name;
$subcat_id = $subcategory->term_id;
$subcat_slug = $subcategory->slug;
// Display the name of each individual subcategory with ID and Slug
echo '<h4>Subcategory: ' . $subcat_name . ' - ID: ' . $subcat_id . ' - Slug: ' . $subcat_slug . '</h4>';
// Get all posts that belong to this specific subcategory
$posts = new WP_Query(
array(
'post_type' => $post_type,
'posts_per_page' => -1, // <-- Show all posts
'hide_empty' => true,
'order' => 'ASC',
'tax_query' => array(
array(
'taxonomy' => $taxonomy,
'terms' => $subcat_id,
'field' => 'id'
)
)
)
);
// If there are posts available within this subcategory
if ( $posts->have_posts() ):
?>
<ul>
<?php
while ( $posts->have_posts() ): $posts->the_post();
//Show the title of each post with the Post ID
?>
<li>Post: <?php the_title(); ?> - ID: <?php the_ID(); ?></li>
<?php
endwhile;
?>
</ul>
<?php
else:
echo 'No posts found';
endif;
wp_reset_query();
}
?>
</div>
<?php
}
ow_subcategories_with_posts_by_category( 'name-of-your-taxonomy', 'name-of-your-post-type', 'name-of-your-specific-term' );
'name-of-your-taxonomy' is the name of the main taxonomy. e.g.: 'victual_category'
'name-of-your-post-type' is the name of your post type. e.g.: 'victual'
'name-of-your-specific-term' is the name of the specific category that you want to use so that subcategories that belong to that category can be displayed. e.g.: 'food'
So if I call the function:
ow_subcategories_with_posts_by_category( 'victual_category', 'victual', 'food' );
That would display all the subcategories with their respective Posts that belongs to Food of the Victual-Category taxonomy:
Subcategory: Appetizers - ID: 35 - Slug: appetizers
Post: Chips & Salsa - ID: 464
Post: Queso - ID: 465
Subcategory: Tacos - ID: 36 - Slug: tacos
Post: Al Pastor - ID: 466
Post: Fish Al Pastor - ID: 467