display wordpress posts by sub category - php

Question

I am new in wordpress, I am using wordpress Version 4.5, I like to display posts by subcategories, anyone please help how can I do this.
This is what I want
PARENT CATEGORY NAME
SUB CATEGORY 1
Post 1
Post 2
SUB CATEGORY 2
Post 3
Post 4
SUB CATEGORY 3
Post 5
Post 6
...
Thanks in advance

Answer 1

If I am not wrong you need this, you need double loop to fetch the posts under subcategories
this is how you get current page category
<?php
$categories = get_the_category();
$catID = $categories[0]->cat_ID;
?>
and then do this by using above catID
<?php
$subcats = get_categories('child_of=' . $catID);
foreach($subcats as $subcat) {
echo '<h3>' . $subcat->cat_name . '</h3>';
echo '<ul>';
$subcat_posts = get_posts('cat=' . $subcat->cat_ID);
foreach($subcat_posts as $subcat_post) {
$postID = $subcat_post->ID;
echo '<li>';
echo '<a href="' . get_permalink($postID) . '">';
echo get_the_title($postID);
echo '</a>';
echo '</li>';
}
echo '</ul>';
}
?>

Answer 2

If you want to show all the categories that have subcategories with their respective subcategories that have posts with their respective posts, you can easily do that with the following function, as long as you know the slug of the taxonomy and the post type.
For example if you have a custom post type called 'books' and a custom taxonomy to classify your books called 'topic',
then you would call this function using
ow_categories_with_subcategories_and_posts( 'topic', 'book' );
That will display a list of all the topics with their respective subcategories followed by the books that belong to each subcategory.
Something like
Drama
drama subcategory 1
book1
book2
book3
drama subcategory 2
book4
book5
Comedy
comedy subcategory 1
book6
book7
comedy subcategory 2
book8
book9
The following is the code for this:
function ow_categories_with_subcategories_and_posts( $taxonomy, $post_type ) {
// Get the top categories that belong to the provided taxonomy (the ones without parent)
$categories = get_terms(
array(
'taxonomy' => $taxonomy,
'parent' => 0, // <-- No Parent
'orderby' => 'term_id',
'hide_empty' => true // <!-- change to false to also display empty ones
)
);
?>
<div>
<?php
// Iterate through all categories to display each individual category
foreach ( $categories as $category ) {
$cat_name = $category->name;
$cat_id = $category->term_id;
$cat_slug = $category->slug;
// Display the name of each individual category
echo '<h3>Category: ' . $cat_name . ' - ID: ' . $cat_id . ' - Slug: ' . $cat_slug . '</h3>';
// Get all the subcategories that belong to the current category
$subcategories = get_terms(
array(
'taxonomy' => $taxonomy,
'parent' => $cat_id, // <-- The parent is the current category
'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() ):
?>
<div>
<?php
// As long as there are posts to show
while ( $posts->have_posts() ): $posts->the_post();
//Show the title of each post with the Post ID
?>
<p>Post: <?php the_title(); ?> - ID: <?php the_ID(); ?></p>
<?php
endwhile;
?>
</div>
<?php
else:
echo 'No posts found';
endif;
wp_reset_query();
}
?>
</div>
<?php
}
?>
</div>
<?php
}
Then if you ONLY want to get the subcategories related to comedy, and you want to provide the 'comedy' slug as a filter to get something like:
comedy subcategory 1
book6
book7
comedy subcategory 2
book8
book9
Then you would call the following function like this:
ow_subcategories_with_posts_by_category( 'topic', 'book', 'comedy' );
And the function to do that will be:
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() ):
?>
<div>
<?php
while ( $posts->have_posts() ): $posts->the_post();
//Show the title of each post with the Post ID
?>
<p>Post: <?php the_title(); ?> - ID: <?php the_ID(); ?></p>
<?php
endwhile;
?>
</div>
<?php
else:
echo 'No posts found';
endif;
wp_reset_query();
}
?>
</div>
<?php
}