WP_User_Query::fill_query_vars( array $args )

	public static function fill_query_vars( $args ) {
		$defaults = array(
			'blog_id' => get_current_blog_id(),
			'role' => '',
			'role__in' => array(),
			'role__not_in' => array(),
			'meta_key' => '',
			'meta_value' => '',
			'meta_compare' => '',
			'include' => array(),
			'exclude' => array(),
			'search' => '',
			'search_columns' => array(),
			'orderby' => 'login',
			'order' => 'ASC',
			'offset' => '',
			'number' => '',
			'paged' => 1,
			'count_total' => true,
			'fields' => 'all',
			'who' => '',
			'has_published_posts' => null,
			'nicename' => '',
			'nicename__in' => array(),
			'nicename__not_in' => array(),
			'login' => '',
			'login__in' => array(),
			'login__not_in' => array()
		);

		return wp_parse_args( $args, $defaults );
	}