How to hide some categories in category list under post in wordpress?

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In My wodpress Blog there are some categories use for the internal work. I want to hide that categories in blog homepage category list show under each post.

I print category list as print(the_category($postID));

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How to hide or make filter for that category list print under each post?

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  1. I’m afraid that in this case you will have to go throught the categories and have some logic here.
    you can use a function like this one:

    function filterCategories($postId,$excluded, $separator){
    $categoriesToDisplay = '';
    $count = 0;
    $allCategories = get_the_category($postId);
    foreach($allCategories as $category) {
        if ( !in_array($category->cat_ID, $excluded) ) {

           // get that category link
           $cat_link = $get_category_link($category->cat_ID);       
           $categoriesToDisplay .= $cat_link;

           // we want a separator, but not at the end...
           if($count < count($categories)){
               $categoriesToDisplay .= $separator;
           }
        }
        $count++;
    }
        return $categoriesToDisplay;
}

    It will trancate the categores you want without the excluded as links seperated by what ever you want (in this case “|”)
    You can call it within your loop:

         <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
     <?php $id = get_the_ID(); ?>
     <?php echo filterCategories($id, array(1,2,3,4)," | "); ?>

    $categories array will be the array of categories objects what you can then display as:

    I haven’t tested it, but it should work.

    To get the excluded categories you can use a parent category called “excluded” or something like that. than they can be available for you easily:

    $excluded = wp_list_categories("child_of=".$excludedCategoriId);

    Hope it helps.