Come ottenere lo slug della categoria genitore del post corrente

Dovrai utilizzareil valore ID restituito da $category[0]->category_parente passarlo attraverso get_term().Esempio:

 $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;
}
 

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;
}

Sarànecessarioeseguire una queryperi dati della categoriaprincipale. get_category èpraticamente costruitoperfarlo.

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

Ciò restituiràilgenitoreimmediato della categoria. Questo è dato questoinsieme di categorie:

• Cartone animato
  • Cane
    • Scooby

Il codice sopra restituirà "Dog" segli dai l'ID di "Scooby". Se desideri la categoriaprincipalepiùin alto,"Cartone animato",nonimporta quanto siaprofonda lanidificazione,usa qualcosa delgenere:

 $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($parent)) {
  var_dump($parent);
} else {
  echo $parent->get_error_message();
}
 

Questo ha ancheil vantaggio di unagestione deglierrori relativamente accurata.

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($parent)) {
  var_dump($parent);
} else {
  echo $parent->get_error_message();
}

That also has the advantage of relatively neat error handling.

Mipiace la rispostaprecedente di @s_ha_dum,maper ottenere la categoria diprimo livelloindipendentemente dallaprofondità,ho utilizzato quella che considero una soluzionepiù semplice:

 $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
 

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

Sepuò aiutare qualcuno ... a ottenere ungatto o ungenitorebambino,a seconda di 0 o 1 chemetti su $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';
}
 

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';
}

Puoi semplificarloin questomodo:

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

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;

La seguentefunzione è adattataper restituire la categoria root :

 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;
}
 

Utilizzo: get_root_category()->slug

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