List all subcategories from category

How can I get all subcategories from a certain category?

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Answers:

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Method 1

Yes, you can use get_categories() using 'child_of' attribute.
For example all sub categories of category with the ID of 17:

$args = array('child_of' => 17);
$categories = get_categories( $args );
foreach($categories as $category) { 
    echo '<p>Category: <a href="' . get_category_link( $category->term_id ) . '" rel="nofollow noreferrer noopener" rel="nofollow noreferrer noopener" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> </p> ';
    echo '<p> Description:'. $category->description . '</p>';
    echo '<p> Post Count: '. $category->count . '</p>';  
}

This will get all categories that are descendants (i.e. children & grandchildren).

If you want to display only categories that are direct descendants (i.e. children only) you can use 'parent' attribute.

$args = array('parent' => 17);
$categories = get_categories( $args );
foreach($categories as $category) { 
    echo '<p>Category: <a href="' . get_category_link( $category->term_id ) . '" rel="nofollow noreferrer noopener" rel="nofollow noreferrer noopener" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> </p> ';
    echo '<p> Description:'. $category->description . '</p>';
    echo '<p> Post Count: '. $category->count . '</p>';  
}

Method 2

For custom post types “categories” use get_terms().

(Altering @Bainternet’s answer)

            $categories = get_terms( array(
                'taxonomy' => 'product_cat',
                'hide_empty' => false,
                'parent' => 17 // or 
                //'child_of' => 17 // to target not only direct children
            ) );
            
            foreach($categories as $category) { 
                echo '<p>Category: <a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> </p> ';
                echo '<p> Description:'. $category->description . '</p>';
                echo '<p> Post Count: '. $category->count . '</p>';  
            }

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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