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list top parent category of post and parent\'s subcategories

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  1. /**
  2.  * list of post's top parent category as a h3 and all subcategories of it, 
  3.  * current post's category highlighted with a class
  4.  */
  5.  
  6. function list_subcategories () {                                                                             
  7.     $hide_empty = 0;                                                                                                       
  8.     $current_class = 'current_item';                                                                                       
  9.     global $post;
  10.  
  11.     //id of the current post
  12.     $this_post_ID = $post->ID;                                                                                             
  13.  
  14.     //categories list of curent post
  15.     $categories = get_the_category($post->ID);                                                                             
  16.  
  17.     //first category, parent category of current post
  18.     $category_id = $categories[0]->cat_ID;
  19.  
  20.     // if it's not root category (0) then do
  21.     if ($category_id) {
  22.  
  23.         // get alphabetical list of parent categories separated with ","
  24.         $parentCatList = get_category_parents( $category_id, false, ",");
  25.  
  26.         // get first category slug of that list...
  27.         $topParentSlug = substr( $parentCatList, 0, strpos($parentCatList, ',') );                                              
  28.  
  29.         // get the object of that slug
  30.         $topParent = get_term_by( 'slug', $topParentSlug, 'category' );
  31.  
  32.         // get the id of that object 
  33.         $ancestor = $topParent->term_id;
  34.  
  35.         // echo the name of the parent category
  36.         echo "<h3>$topParent->name</h3>";
  37.  
  38.         //list of parent category's categories
  39.         echo '<ul>';
  40.  
  41.             // making the array of subcategories objects
  42.             $cat_array = get_categories( "echo=0&title_li=&depth=$levels&child_of=$ancestor&hide_empty=$hide_empty" );          
  43.  
  44.             foreach($cat_array as $category) { 
  45.  
  46.                 // if the listed cat. is the current post's category, we set it as current
  47.                 if ( $category_id == $category->cat_ID ) { $is_current = "class='" .$current_class."'"; }                    
  48.  
  49.                 // list the category with a link 
  50.                 echo '<li '. $is_current .'><a href="'.get_category_link( $category->term_id ).'">'. $category->name.'</a></li>';
  51.  
  52.             }
  53.         echo "</ul>";
  54.     }
  55. }

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