wp_get_users_with_no_role( int|null $site_id = null ): string[]

3695function wp_get_users_with_no_role( $site_id = null ) {3696	global $wpdb;3697 3698	if ( ! $site_id ) {3699		$site_id = get_current_blog_id();3700	}3701 3702	$prefix = $wpdb->get_blog_prefix( $site_id );3703 3704	if ( is_multisite() && get_current_blog_id() !== $site_id ) {3705		switch_to_blog( $site_id );3706		$role_names = wp_roles()->get_names();3707		restore_current_blog();3708	} else {3709		$role_names = wp_roles()->get_names();3710	}3711 3712	$regex = implode( '|', array_keys( $role_names ) );3713	$regex = preg_replace( '/[^a-zA-Z_\|-]/', '', $regex );3714	$users = $wpdb->get_col(3715		$wpdb->prepare(3716			"SELECT user_id3717			FROM $wpdb->usermeta3718			WHERE meta_key = '{$prefix}capabilities'3719			AND meta_value NOT REGEXP %s",3720			$regex3721		)3722	);3723 3724	return $users;3725}