WordPress get all categories

    function get_all_categories($taxonomy) {

        $terms = get_terms(
            array(
                'taxonomy'      => $taxonomy,
                'hide_empty'    => false,
            )
        );
        
        if ( $terms && ! is_wp_error( $terms ) ) : 
        
            $output = "";

            $draught_links = array();

            foreach ( $terms as $term ) {
                $term_link = get_term_link( $term );
                $draught_links[] = $term->name;

                $output .= "<span>
                                <a href='".$term_link."'>".$term->name."</a>
                            </span>";

            }

            $on_draught = join( " ", $draught_links );

            return $output;

        endif;

    }