AnsPress_Category::filter_active_category( $active,  $filter )

	public static function filter_active_category( $active, $filter ) {
		$current_filters = ap_get_current_list_filters( 'category' );

		if ( ! empty( $current_filters ) ) {
			$args = array(
				'hierarchical'  => true,
				'hide_if_empty' => true,
				'number'        => 2,
				'include'       => $current_filters,
			);

			$terms = get_terms( 'question_category', $args );

			if ( $terms ) {
				$active_terms = [];
				foreach ( (array) $terms as $t ) {
					$active_terms[] = $t->name;
				}

				$count = count( $current_filters );
				$more_label = sprintf( __( ', %d+', 'anspress-question-answer' ), $count - 2 );

				return ': <span class="ap-filter-active">' . implode( ', ', $active_terms ) . ( $count > 2 ? $more_label : ''  ) . '</span>';
			}
		}
	}