php用静态函数创建自己的实例

class Registry{
	private static $instance;
	private $user;
	private $pass;
	public $logarray=array();
	static function getAccessManager(){
		if(empty(self::$instance)){
			self::$instance=new self();
		} 
		return self::$instance;
	}
	function login($user,$pass){
		if(!empty($user) && !empty($pass)){
			$this->user=$user;
			$this->pass=$pass;
			array_push($this->logarray,$this->user,$this->pass);
		}
		return $this->logarray;
	}
	function getError(){
		echo "用户名和密码不能为空";
	}
}
$reg=Registry::getAccessManager();//这里就是自己创建自己的实例,这个方法主要是方便组合到其它的类的方法中
$reg->login('bob','123');