wp_get_users_with_no_role( int|null $site_id = null )

Get the user IDs of all users with no role on this site.


Parameters

$site_id

(Optional) The site ID to get users with no role for. Defaults to the current site.

Default value: null


Return

(array) Array of user IDs.


Source

File: wp-includes/user.php

function wp_get_users_with_no_role( $site_id = null ) {
	global $wpdb;

	if ( ! $site_id ) {
		$site_id = get_current_blog_id();
	}

	$prefix = $wpdb->get_blog_prefix( $site_id );

	if ( is_multisite() && $site_id != get_current_blog_id() ) {
		switch_to_blog( $site_id );
		$role_names = wp_roles()->get_names();
		restore_current_blog();
	} else {
		$role_names = wp_roles()->get_names();
	}

	$regex  = implode( '|', array_keys( $role_names ) );
	$regex  = preg_replace( '/[^a-zA-Z_\|-]/', '', $regex );
	$users  = $wpdb->get_col( $wpdb->prepare( "
		SELECT user_id
		FROM $wpdb->usermeta
		WHERE meta_key = '{$prefix}capabilities'
		AND meta_value NOT REGEXP %s
	", $regex ) );

	return $users;
}


Changelog

Changelog
Version Description
WP-4.9.0 The $site_id parameter was added to support multisite.
WP-4.4.0 Introduced.