<?php
/**
* Created by PhpStorm.
* User:
* Date: 2018/12/6
* Time: 14:11
*/
class Site
{
//属性
public $siteName;
//本类的静态实例
protected static $instance = null;
//禁用构造器
private function __construct($siteName){
$this->siteName = $siteName;
}
//获取本类唯一实例
public static function getInstance($siteName){
if(!self::$instance instanceof self){
self::$instance = new self($siteName);
}
return self::$instance;
}
}
//使用工厂模式生成类的单一实例
class Factory
{
//创建指定类的实例
public static function create()
{
return Site::getInstance('PHP');
}
}
//对象注册树
/**
* Class Register
* 1. 注册:set(),把对象挂到树上
* 2. 获取:get(),把对象取来用
* 3. 注销:unset():把对象吃掉
*/
class Register
{
//创建对象池:数组
protected static $objects = [];
//生成对象并上树
public static function set($alias,$object){
self::$objects[$alias] = $object;
}
//从树上取出对象
public static function get($alias){
return self::$objects[$alias];
}
//注销树上对象
public static function _unset($alias){
unset(self::$objects[$alias]) ;
}
}
//将Site类的实例加入对象资源池
Register::set('site',Factory::create());
//获得对象
$obj = Register::get('site');
var_dump($obj);
var_dump($obj->siteName);
PHP的单例模式 ,工厂模式,注册模式的例子
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转载自blog.csdn.net/qq_38866543/article/details/84855378
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