Exclude a category from the_category in the single post page

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I want to include something like the the_category function in a WordPress post, which by default echoes a list of links to all categories the post is attached separated by comma, but I want to exclude some categories from listing in certain views. In some cases I have to exclude all children ones from appearing, in others a top category or random specific categories.

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2 comments

  1. Not sure but i think you can try this

    function my_category_filter($cats){
   //exclude these from displaying
   $exclude = array("Large Announcement", "Announcement", "News");
   $Catds = array();
   foreach ($cats as$cat){
      if (!in_array($cat,$exclude)){$Catsa[] = $cat;}
   }
   return $Catsa;
}

add_filter('the_category','my_category_filter');

  2. Enter this handy function from the WordPress support forums — just add it to your theme’s functions.php file:

    function the_category_filter($thelist,$separator=' ') {
     // list the IDs of the categories to exclude
     $exclude = array(366);
     // create an empty array
     $exclude2 = array();

     // loop through the excluded IDs and get their actual names
     foreach($exclude as $c) {
          // store the names in the second array
          $exclude2[] = get_cat_name($c);
     }

     // get the list of categories for the current post     
     $cats = explode($separator,$thelist);
     // create another empty array      
     $newlist = array();

     foreach($cats as $cat) {
          // remove the tags from each category
          $catname = trim(strip_tags($cat));

          // check against the excluded categories
          if(!in_array($catname,$exclude2))

          // if not in that list, add to the new array
          $newlist[] = $cat;
     }
     // return the new, shortened list
     return implode($separator,$newlist);
}

// add the filter to 'the_category' tag
add_filter('the_category','the_category_filter', 10, 2);

    Initially, I did have some issues with this function; after some tinkering around, I realized I needed a separator declared in the_category() tag, like a comma, dash, etc. In this case, I was using just a space — the_category(' ') — which wasn’t working, but swapping it out for a non-breaking space did the trick: the_category(' ').

    Credit: http://www.stemlegal.com/greenhouse/2012/excluding-categories-from-the-category-tag-in-wordpres/