Title: ClassDiscovery::instantiateClass
Published: May 20, 2026

---

# ClassDiscovery::instantiateClass( string|Closure $class ): object

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-classdiscovery/instantiateclass/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-classdiscovery/instantiateclass/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-classdiscovery/instantiateclass/?output_format=md#source)

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

Get an instance of the $class.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wordpress-aiclientdependencies-http-discovery-classdiscovery/instantiateclass/?output_format=md#parameters)󠁿

 `$class`string|Closurerequired

a FQCN of a class or a closure that instantiate the class

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

 object

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

    ```php
    protected static function instantiateClass($class)
    {
        try {
            if (is_string($class)) {
                return new $class();
            }
            if (is_callable($class)) {
                return $class();
            }
        } catch (\Exception $e) {
            throw new ClassInstantiationFailedException('Unexpected exception when instantiating class.', 0, $e);
        }
        throw new ClassInstantiationFailedException('Could not instantiate class because parameter is neither a callable nor a string');
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/php-ai-client/third-party/http/discovery/classdiscovery.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/php-ai-client/third-party/Http/Discovery/ClassDiscovery.php#L186)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/php-ai-client/third-party/Http/Discovery/ClassDiscovery.php#L186-L199)

## User Contributed Notes

You must [log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fclasses%2Fwordpress-aiclientdependencies-http-discovery-classdiscovery%2Finstantiateclass%2F)
before being able to contribute a note or feedback.