$criteria = new Criteria(); $criteria->addCondition("age", ">", 18); $users = User::find($criteria);In this example, we create a new Criteria object that specifies that we want to select all users over the age of 18. We then use the `find` method of the `User` class to retrieve all users that meet this criteria. There are many packages and libraries available for implementing the Criteria pattern in PHP, including the Doctrine ORM and the Laravel Eloquent ORM. Depending on the specific requirements of your project, one of these libraries may be a good choice for implementing the Criteria pattern.