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1. guischarf
   Member
   Posted 3 years ago #

   Hi,

   I am working on a template that uses different navigation bars for different categories. When displaying category pages (archive.php) I have no problems finding out which category navbar to display. This is the code I use in header.php:

   if (is_category()):
      $catID = get_cat_id(single_cat_title('', FALSE));
      $actualcat = get_category($catID);
      if ($actualcat->parent != 0):
         $catID = $actualcat->parent;
      endif;
   ...

   However, if I am in single.php I cannot find a way to get the categories of the post. This is the complete code I intend to use:

   if (is_home()):
      wp_list_categories('title_li=&depth=1');
   else:
      if (is_category()):
         $catID = get_cat_id(single_cat_title('', FALSE));
         $actual_cat = get_category($catID);
         if ($actual_cat->parent != 0):
            $catID = $actual_cat->parent;
         endif;
      elseif (is_single());
         HOW DO I GET THE CATEGORIES
      endif;
      wp_list_categories('title_li=&depth=1&child_of='.$catID);
   endif;

   Any ideas?

2. MichaelH
   Volunteer
   Posted 3 years ago #

   I used this for something once that should give you what you want:

   <?php
   if (is_single( )) {
     $ID = $wp_query->posts[0]->ID;
     $postcat = get_the_category($ID);
     $cat = $postcat[0]->cat_ID;
     $parent = get_category ($cat);
       if ($parent->parent) {
         wp_list_categories ('child_of=' . $parent->parent);
         } else {
         wp_list_categories ('child_of=' . $cat);
       }
     }
   ?>

3. guischarf
   Member
   Posted 3 years ago #

   Thanks Michael. I will try that out. I ended up doing the following, but your solution seems way more elegant.

   ...
   elseif (is_single()):
      if (have_posts()) :
         while (have_posts()) :
            the_post();
            foreach (get_the_category() as $thecat):
               if ($thecat->parent != 0):
                  $catIDarray[] = $thecat->parent;
               else:
                  $catIDarray[] = $thecat->cat_ID;
               endif;
            endforeach;
            //if more than one category, write an algo to selec one according to a priority table.
            $catID = $catIDarray[0];
         endwhile;
      endif;
    endif;

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