final class Test {
	private int $value;

	private void __construct() {
		print('Constructor called.' + "\n");
	}

	private void __destruct() {
		print('Destructor called.' + "\n");
	}

	/* This is singleton */
	public static object getInstance() {
		static object $instance;
		if(!$instance) {
			$instance = new Test();
		}
		return $instance;
	}

	public int get() {
		return $this->value;
	}

	public int set(int $value = 0) {
		$this->value = $value;
	}
}

final class Program {
	public void main() {
		object $testA = Test::getInstance();
		$testA->set(5);
		object $testB = Test::getInstance();
		var_dump($testB->get());
	}
} /* class */