class Counter { private $count = 0; public function increment() { $this->setState(["count" => $this->count + 1]); } public function setState($state) { foreach ($state as $key => $value) { $this->$key = $value; } } } $counter = new Counter(); $counter->increment(); echo $counter->count; // Output: 1In this example, we have a Counter class that has a private count variable initialized to 0. The increment method increments the count using the setState method by passing an array of updated state properties. The setState method updates the count value to the new value. It's hard to determine the specific package library being used in this example since the setState method is not specific to any package library. It is a common method used in PHP programming to update state properties.