My theme has styling by category using the following code, which inserts the current category's slug as a CSS class.

<div class="CategorySpecificStyle 
    <?php $category = get_the_category(); echo $category[0]->slug; ?>">
        <?php echo $category[0]->cat_name; ?>

Now i'm about to add a large number of new sub-categories, and it seems silly to add them all in CSS when I should be able to just select the parent category of the current post and apply styles to that.

I've been able to get the parent category's name:

$parentcat = get_cat_name($category[0]->category_parent);

But spaces (and capitalization) is an issue... And I can't seem to get the parent category's slug.

I know i'm probably missing a simple step somewhere, but any insight would be greatly appreciated.


You will need to use the ID value returned by $category[0]->category_parent and pass it through get_term(). Example:

$category = get_the_category(); 
$category_parent_id = $category[0]->category_parent;
if ( $category_parent_id != 0 ) {
    $category_parent = get_term( $category_parent_id, 'category' );
    $css_slug = $category_parent->slug;
} else {
    $css_slug = $category[0]->slug;
| improve this answer | |

You will need to query for the parent category data. get_category is pretty much built for doing that.

$category = get_the_category(); 
$parent = get_category($category[0]->category_parent);
echo $parent->slug;

That will return the immediate parent of the category. That is given this set of categories:

  • Cartoon
    • Dog
      • Scooby

The code above will return "Dog" if you give it the ID for "Scooby". If you want the topmost parent category-- "Cartoon"-- no matter how deep the nesting, use something like this:

$category = get_the_category(); 
$parent = get_ancestors($category[0]->term_id,'category');
if (empty($parent)) {
  $parent[] = array($category[0]->term_id);
$parent = array_pop($parent);
$parent = get_category($parent); 
if (!is_wp_error($parent)) {
} else {
  echo $parent->get_error_message();

That also has the advantage of relatively neat error handling.

| improve this answer | |
  • Thanks for the answer, and i'll likely use a similar snippet in the future, but it also throws errors if the post in a parent category / category without subcategories. – DLR Jan 26 '14 at 0:10
  • @DLR: Yes, I know. I had to leave before I could complete the answer. I was working on something more complex and more robust. See the edit. – s_ha_dum Jan 26 '14 at 0:30

I like the previous answer from @s_ha_dum, but for getting the top-level category regardless of depth, I used what I consider to be a simpler solution:

$cats = get_the_category();
foreach ( $cats as $cat ) {
    if ( $cat->category_parent == 0 ) {
        return $cat->name; // ...or whatever other attribute/processing you want
return ''; // This was from a shortcode; adjust the return value to taste
| improve this answer | |

If it can help somebody... to get child cat or parent, depending on the 0 or 1 you put on the $category

$category = get_the_category();
$parent = get_cat_name( $category[0]->category_parent );
if( ! function_exists('get_cat_slug') )
    function get_cat_slug($cat_id) {
        $cat_id = (int) $cat_id;
        $category = &get_category($cat_id);
        return $category->slug;
if ( !empty($parent) ) {
    $output .= '<H2>' . esc_html( $category[1]->name ) . '</H2>';                               
} else {
    $output .= '<H2>' . esc_html( $category[0]->name ) . '</H2';
| improve this answer | |

You can simplify it like this:

  $category   = get_the_category();
  $cat_parent = $category[0]->category_parent;
  $category   = $cat_parent != 0 ? get_term($cat_parent, 'category')->slug : $category[0]->slug;
| improve this answer | |

The following function is adapted to return the root category:

function get_root_category($category = null) {
  if (!$category) $category = get_the_category()[0];
  $ancestors = get_ancestors($category->term_id, 'category');
  if (empty($ancestors)) return $category;
  $root = get_category(array_pop($ancestors)); 
  return $root;

Usage: get_root_category()->slug

| improve this answer | |

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