class Value {
	static $counter = 1;
	var $a=10;	
	function get() {
		echo Value::$counter;
		echo "<br/>";
	}
	function getA() {
		echo $this->a;
		echo "<br/>";
	}
	function add() {
		$this->a++;
		self::$counter++;
	}
}
$value = new Value();
$value->get();
$value->add();
$value->get();
$value->getA();