public static function instance($path = '/tmp/')
{
if (!self::$_instance instanceof self) {
self::$_instance = new self($path);
}
return self::$_instance;
}
/**
* 静态方法, 单例统一访问入口
* @return object 返回对象的唯一实例
*/
public static function getInstance()
{
if (is_null(self::$_instance) || !isset(self::$_instance)) {
self::$_instance = new self();
}
return self::$_instance;
}