Title: WP_AI_Client_Cache::set
Published: May 20, 2026

---

# WP_AI_Client_Cache::set( string $key, mixed $value, null|int|DateInterval $ttl = null ): bool

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wp_ai_client_cache/set/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/classes/wp_ai_client_cache/set/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wp_ai_client_cache/set/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_ai_client_cache/set/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_ai_client_cache/set/?output_format=md#changelog)

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

Persists data in the cache, uniquely referenced by a key with an optional expiration
TTL time.

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

 `$key`stringrequired

The key of the item to store.

`$value`mixedrequired

The value of the item to store, must be serializable.

`$ttl`null|int|DateIntervaloptional

The TTL value of this item.

Default:`null`

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wp_ai_client_cache/set/?output_format=md#return)󠁿

 bool True on success and false on failure.

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

    ```php
    public function set( $key, $value, $ttl = null ): bool {
    	$expire = $this->ttl_to_seconds( $ttl );

    	return wp_cache_set( $key, $value, self::CACHE_GROUP, $expire );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/ai-client/adapters/class-wp-ai-client-cache.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/ai-client/adapters/class-wp-ai-client-cache.php#L62)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ai-client/adapters/class-wp-ai-client-cache.php#L62-L66)

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

| Uses | Description | 
| [WP_AI_Client_Cache::ttl_to_seconds()](https://developer.wordpress.org/reference/classes/wp_ai_client_cache/ttl_to_seconds/)`wp-includes/ai-client/adapters/class-wp-ai-client-cache.php` |

Converts a PSR-16 TTL value to seconds for WordPress cache functions.

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

Saves the data to the cache.

  |

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

| Version | Description | 
| [7.0.0](https://developer.wordpress.org/reference/since/7.0.0/) | Introduced. |

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