WordPress at a glance
function is not described

get_author_user_ids() WP 1.0

Deprecated in 3.1.0. It is no longer supported and can be removed in future releases. Use get_users() instead.

Get all user IDs.

  • Global. wpdb. $wpdb WordPress database abstraction object.

No Hooks.

Return

Array. List of user IDs.

Usage

get_author_user_ids();

Code of get author user ids: wp-admin/includes/deprecated.php VER 5.1.1

<?php
function get_author_user_ids() {
	_deprecated_function( __FUNCTION__, '3.1.0', 'get_users()' );

	global $wpdb;
	if ( !is_multisite() )
		$level_key = $wpdb->get_blog_prefix() . 'user_level';
	else
		$level_key = $wpdb->get_blog_prefix() . 'capabilities'; // wpmu site admins don't have user_levels

	return $wpdb->get_col( $wpdb->prepare("SELECT user_id FROM $wpdb->usermeta WHERE meta_key = %s AND meta_value != '0'", $level_key) );
}