设计模式学习（六）、单例模式

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 16-10-21
 * Time: 上午10:19
 */
Class Singleton{
   private  static $_uniqueInstance;
   private function __construct(){

   }
    public static function getInstance(){
        if(!(self::$_uniqueInstance instanceof self)){

            self::$_uniqueInstance = new self;
        }
        return self::$_uniqueInstance;
    }

}