Title: cache_users
Published: April 25, 2014
Last modified: August 20, 2026

---

# cache_users( int[] $user_ids )

## In this article

 * [Parameters](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#wp--skip-link--target)

Retrieves info for user lists to prevent multiple queries by [get_userdata()](https://developer.wordpress.org/reference/functions/get_userdata/).

## 󠀁[Parameters](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#parameters)󠁿

 `$user_ids`int[]required

User ID numbers list

## 󠀁[Source](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#source)󠁿

    ```php
    function cache_users( $user_ids ) {
    	global $wpdb;

    	update_meta_cache( 'user', $user_ids );

    	$clean = _get_non_cached_ids( $user_ids, 'users' );

    	if ( empty( $clean ) ) {
    		return;
    	}

    	$list = implode( ',', $clean );

    	$users = $wpdb->get_results( "SELECT * FROM $wpdb->users WHERE ID IN ($list)" );

    	foreach ( $users as $user ) {
    		update_user_caches( $user );
    	}
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/pluggable.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.1/src/wp-includes/pluggable.php#L125)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.1/src/wp-includes/pluggable.php#L125-L143)

## 󠀁[Related](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#related)󠁿

| Uses | Description | 
| [_get_non_cached_ids()](https://developer.wordpress.org/reference/functions/_get_non_cached_ids/)`wp-includes/functions.php` |

Retrieves IDs that are not already present in the cache.

  | 
| [update_user_caches()](https://developer.wordpress.org/reference/functions/update_user_caches/)`wp-includes/user.php` |

Updates all user caches.

  | 
| [update_meta_cache()](https://developer.wordpress.org/reference/functions/update_meta_cache/)`wp-includes/meta.php` |

Updates the metadata cache for the specified objects.

  | 
| [wpdb::get_results()](https://developer.wordpress.org/reference/classes/wpdb/get_results/)`wp-includes/class-wpdb.php` |

Retrieves an entire SQL result set from the database (i.e., many rows).

  |

[Show 1 more](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#)
[Show less](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#)

| Used by | Description | 
| [update_post_author_caches()](https://developer.wordpress.org/reference/functions/update_post_author_caches/)`wp-includes/post.php` |

Updates post author user caches for a list of post objects.

  | 
| [WP_User_Query::query()](https://developer.wordpress.org/reference/classes/wp_user_query/query/)`wp-includes/class-wp-user-query.php` |

Executes the query, with the current variables.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/functions/cache_users/?output_format=md#changelog)󠁿

| Version | Description | 
| [3.0.0](https://developer.wordpress.org/reference/since/3.0.0/) | Introduced. |

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