WordPress custom post columns

// reset the column fields and order of the post list table
add_filter('manage_edit-post_columns', 'manage_edit_post_columns');
function manage_edit_post_columns($columns) {
    unset($columns['tags']); // optional, removes the "Tags" column

    // add a custom column with a label of "My Custom Taxonomy Column" and slug of my_custom_taxonomy
    $columns['my_custom_taxonomy'] = __('My Custom Taxonomy Column');

    return $columns;
}

// tell WordPress what to display in the post list table column we created using the 'manage_edit-post_columns' hook
add_action( 'manage_posts_custom_column', 'manage_edit_post_column', 10, 2);
function manage_edit_post_column($column_name, $post_id ) {
    $post = get_post($post_id);

    switch ($column_name) {
        case 'my_custom_taxonomy':
            unset($medgadget_display_term_links);
            $my_custom_taxonomy_terms = get_the_terms( $post_id, 'my_custom_taxonomy_slug' );

            if ( !empty($my_custom_taxonomy_terms) ) {
                $out = array();
                foreach ($my_custom_taxonomy_terms as $term) {
                    $out[] = sprintf( '<a href="%s">%s</a>',
                        esc_url( add_query_arg( array( 'post_type' => $post->post_type, 'my_custom_taxonomy_slug' => $term->slug ), 'edit.php' ) ),
                        esc_html( sanitize_term_field( 'name', $term->name, $term->term_id, 'my_custom_taxonomy_slug', 'display' ) )
                    );
                }
                echo join( '<br />', $out );
            }
            else {
                echo 'No terms found';
            }
            break;
        case 'another_custom_column' :
            // example of how to add multiple custom columns, so let's not display anything right now
            break;
        default:
            break;
    }
}