Final Class Yiisoft\Hydrator\AttributeHandling\ResolverFactory\ReflectionAttributeResolverFactory

                public function create(DataAttributeInterface|ParameterAttributeInterface $attribute): object
{
    $resolver = $attribute->getResolver();
    if (!is_string($resolver)) {
        return $resolver;
    }
    if (!class_exists($resolver)) {
        throw new AttributeResolverNonInstantiableException(
            sprintf(
                'Class "%s" does not exist.',
                $resolver,
            ),
        );
    }
    $reflectionClass = new ReflectionClass($resolver);
    if ($reflectionClass->isAbstract()) {
        throw new AttributeResolverNonInstantiableException(
            sprintf(
                '"%s" is not instantiable because it is abstract.',
                $reflectionClass->getName(),
            ),
        );
    }
    $constructor = $reflectionClass->getConstructor();
    if ($constructor !== null) {
        if (!$constructor->isPublic()) {
            throw new AttributeResolverNonInstantiableException(
                sprintf(
                    'Class "%s" is not instantiable because of non-public constructor.',
                    $constructor->getDeclaringClass()->getName(),
                ),
            );
        }
        if ($constructor->getNumberOfRequiredParameters() > 0) {
            throw new AttributeResolverNonInstantiableException(
                sprintf(
                    'Class "%s" cannot be instantiated because it has %d required parameters in constructor.',
                    $constructor->getDeclaringClass()->getName(),
                    $constructor->getNumberOfRequiredParameters(),
                )
            );
        }
    }
    return $reflectionClass->newInstance();
}