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

---

# WP_AI_Client_Cache::ttl_to_seconds( null|int|DateInterval $ttl ): int

## In this article

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

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

This function’s access is marked private. This means it is not intended for use 
by plugin or theme developers, only by core. It is listed here for completeness.

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

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

 `$ttl`null|int|DateIntervalrequired

The TTL value.

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

 int The TTL in seconds, or 0 for no expiration.

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

    ```php
    private function ttl_to_seconds( $ttl ): int {
    	if ( null === $ttl ) {
    		return 0;
    	}

    	if ( $ttl instanceof DateInterval ) {
    		$now = new DateTime();
    		$end = ( clone $now )->add( $ttl );

    		return $end->getTimestamp() - $now->getTimestamp();
    	}

    	return max( 0, (int) $ttl );
    }
    ```

[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#L186)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/ai-client/adapters/class-wp-ai-client-cache.php#L186-L199)

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

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

Persists a set of key => value pairs in the cache, with an optional TTL.

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

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

  |

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

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

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