PHP的單例模式 ，工廠模式，註冊模式的例子
阿新 • • 發佈：2018-12-07
<?php /** * Created by PhpStorm. * User: * Date: 2018/12/6 * Time: 14:11 */ class Site { //屬性 public $siteName; //本類的靜態例項 protected static $instance = null; //禁用構造器 private function __construct($siteName){ $this->siteName = $siteName; } //獲取本類唯一例項 public static function getInstance($siteName){ if(!self::$instance instanceof self){ self::$instance = new self($siteName); } return self::$instance; } } //使用工廠模式生成類的單一例項 class Factory { //建立指定類的例項 public static function create() { return Site::getInstance('PHP'); } } //物件註冊樹 /** * Class Register * 1. 註冊：set(),把物件掛到樹上 * 2. 獲取：get(),把物件取來用 * 3. 登出：unset()：把物件吃掉 */ class Register { //建立物件池：陣列 protected static $objects = []; //生成物件並上樹 public static function set($alias,$object){ self::$objects[$alias] = $object; } //從樹上取出物件 public static function get($alias){ return self::$objects[$alias]; } //登出樹上物件 public static function _unset($alias){ unset(self::$objects[$alias]) ; } } //將Site類的例項加入物件資源池 Register::set('site',Factory::create()); //獲得物件 $obj = Register::get('site'); var_dump($obj); var_dump($obj->siteName);