Hide a certain category name without removing it?

Question

I have a category called feature which I use to have a feature post in the homepage. The problem is I don't want the category name feature to appear in this posts, but I want the other categories to show up.

How could I do that?

Answer 1

To achieve this we need to use get_the_category here. I am going to use this code in several places, so it is more efficient to create a function

function exclude_cats($excludedcats = array()){

    $categories = get_the_category();
    $separator = ', ';
    $output = '';
    foreach($categories as $category) {
        if ( !in_array($category->cat_ID, $excludedcats) ) {
            $output .= 'term_id ).'" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '">'.$category->cat_name.''.$separator;
        }
    }
    echo trim($output, $separator);

}

All that I've done inside the function was to call get_the_category function, But I've excluded the categories I don't want to show their names to not show.

inside the index I've called the function like so exclude_cats(array(11, 40, 53));

Answer 2

I think @Lafif Astahdziq was on the right track - I like his approach even though it is fairly static. Here is how I rewrote it:

add_filter('get_the_terms', 'hide_categories_terms', 10, 3);
function hide_categories_terms($terms, $post_id, $taxonomy){

    // define which category IDs you want to hide
    $excludeIDs = array(6);

    // get all the terms 
    $exclude = array();
    foreach ($excludeIDs as $id) {
        $exclude[] = get_term_by('id', $id, 'category');
    }

    // filter the categories
    if (!is_admin()) {
        foreach($terms as $key => $term){
            if($term->taxonomy == "category"){
                foreach ($exclude as $exKey => $exTerm) {
                    if($term->term_id == $exTerm->term_id) unset($terms[$key]);
                }
            }
        }
    }

    return $terms;
}

Put this in your functions.php and it will work.

Answer 3

How about using get_the_terms filter like this,,

add_filter('get_the_terms', 'hide_categories_terms', 10, 3);
function hide_categories_terms($terms, $post_id, $taxonomy){

    // get term to exclude by name, by id or maybe by slug
    $exclude = get_term_by('name', 'feature', 'category', ARRAY_A);

    if (!is_admin()) {
        foreach($terms as $key => $term){
            if($term->taxonomy == "category"){
                if(in_array($key, $exclude)) unset($terms[$key]);
            }
        }
    }

    return $terms;
}

i think it should works,,

Answer 4

An old question but still quite popular so I have added another solution to add to your theme's functions.php file.

function hide_feature($query){
    if($query->is_main_query() && $query->is_home()){
        //negate the ID of the 'feature' category e.g. '-6'
        $query->set('cat', '-6');   
    }
}
add_action( 'pre_get_posts', 'hide_feature' );

Answer 5

Simplified version of the answer by Stefan Wimmer:

add_filter('get_the_terms', function ($terms, $post_id, $taxonomy) {
    // from https://wordpress.stackexchange.com/a/230921
    $exclude_categories = array(45);
    if (!is_admin()) {
        foreach($terms as $key => $term){
            if($term->taxonomy == "category" && in_array($term->term_id, $exclude_categories)) {
                unset($terms[$key]);
            }
        }
    }
    return $terms;
}, 100, 3);

I think that the call to get_term_by can be omitted and used in_array instead of a loop.