This package provides you a set of stubs for RdKafka extension. It currently supports version 4.0. For older verisions of rdkafka extenstion (3.x and 0.9) please use version 1.x of this repository.
Add package to your composer.json dev dependencies
$ composer require kwn/php-rdkafka-stubs --dev
Once package is installed, your IDE should simply discover all stubs automatically. Please notice, that kwn/php-rdkafka-stubs
package has no autoloader configuration provided, so stubs classes are visible in your IDE, but don't clashes with rdkafka
extension namespaces.