单件模式 控件PHP类的实例化次数

echo "单件模式 控件PHP类的实例化次数";
class text
{
	const name="text";
	public static $havenew = false;
	public $name = "我被限制为只能实例化一次！";


	protected static $o_self;


	private function __construct()
	{

	}

	public function __destruct()
	{
		self::$havenew = false;
	}

	public static function initer()
	{
		if(empty(self::$o_self))
			  self::$o_self = new self;
		else{
			echo "类：".self::name."已经实例化!";
		}
		return self::$o_self;	
	}
}

$class = text::initer();
var_dump($class);
echo "<BR><BR>";
$class2 = text::initer();
var_dump($class2);


die();