Add Post Type To Category Archives In Wordpress

Add Post Type To Category Archives

// Add Post Type To Category Archives
add_filter('pre_get_posts', 'query_post_type');
function query_post_type($query) {
  if(is_category() || is_tag()) {
    $post_type = get_query_var('post_type');
  if($post_type)
	    $post_type = $post_type;
	else
	   $post_type = array('nav_menu_item','post','private_post'); // replace private_post to your custom post type, Leave nav_menu_item where it is!
    $query->set('post_type',$post_type);
	return $query;
    }
}