Title: CommonClassesStrategy::isPsr17FactoryInstalled
Published: May 20, 2026
Last modified: August 20, 2026

---

# CommonClassesStrategy::isPsr17FactoryInstalled(): bool

## In this article

 * [Return](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-strategy-commonclassesstrategy/ispsr17factoryinstalled/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-strategy-commonclassesstrategy/ispsr17factoryinstalled/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-strategy-commonclassesstrategy/ispsr17factoryinstalled/?output_format=md#related)

[ Back to top](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-strategy-commonclassesstrategy/ispsr17factoryinstalled/?output_format=md#wp--skip-link--target)

Can be used as a condition.

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-strategy-commonclassesstrategy/ispsr17factoryinstalled/?output_format=md#return)󠁿

 bool

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-strategy-commonclassesstrategy/ispsr17factoryinstalled/?output_format=md#source)󠁿

    ```php
    public static function isPsr17FactoryInstalled()
    {
        try {
            Psr17FactoryDiscovery::findResponseFactory();
        } catch (NotFoundException $e) {
            return \false;
        } catch (\Throwable $e) {
            trigger_error(sprintf('Got exception "%s (%s)" while checking if a PSR-17 ResponseFactory is available', get_class($e), $e->getMessage()), \E_USER_WARNING);
            return \false;
        }
        return \true;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/php-ai-client/third-party/http/discovery/strategy/commonclassesstrategy.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.1/src/wp-includes/php-ai-client/third-party/Http/Discovery/Strategy/CommonClassesStrategy.php#L104)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.1/src/wp-includes/php-ai-client/third-party/Http/Discovery/Strategy/CommonClassesStrategy.php#L104-L115)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-strategy-commonclassesstrategy/ispsr17factoryinstalled/?output_format=md#related)󠁿

| Uses | Description | 
| [Psr17FactoryDiscovery::findResponseFactory()](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-psr17factorydiscovery/findresponsefactory/)`wp-includes/php-ai-client/third-party/Http/Discovery/Psr17FactoryDiscovery.php` |  |

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