Table of Contents
1.1 工厂模式,工厂方法或者类生成对象,而不是在代码直接new
1.2 单例模式,使某个类的对象仅运行创建一个
1.3 注册模式,全局共享和交换对象
2.总结使用
Home Backend Development PHP Tutorial php 3种基本设计模式的组合使用

php 3种基本设计模式的组合使用

Jun 23, 2016 pm 01:31 PM

1.1 工厂模式,工厂方法或者类生成对象,而不是在代码直接new

    class Factory{              static function getDatabase(){            return new Mysql($host, $user, $pass);        }    }    #使用    Factory::getDatabase();
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1.2 单例模式,使某个类的对象仅运行创建一个

  • 1.有个私有的静态对象变量,专门存放本类的对象
  • 2.有个静态的方法来创建对象
  • 3.有个私有的构造函数,防止外部new对象
  • 4.有个clone方法,防止clone return false
    参考文章单例模式
  • class Database {      //单一对象属性     private static $instance;      //定义一些全局变量需要存放属性     private $props = array();      //私有的构造方法     private function __construct(){          echo 'into construct! 该类不允许外部创建对象 ';      }      //返回单一实例     public static function getInstance () {          //判断是否已经有了实例化的对象         if(empty(self::$instance)) {              //可以被override (动态解析)             self::$instance = new static();              //不可以被override (静态解析)             //self::$instance = new self();         }          return self::$instance;      }      public function __clone(){        return '该类禁止clone';    }    //设置属性     public function setProperty ( $key, $value) {          $this->props[$key] = $value;      }      //获取属性     public function getPeoperty ( $key ) {          return $this->props[$key];      }  }  //使用 $dbObj = Database::getInstance();  $dbObj->setProperty('root_path','/www');  $dbObj->setProperty('tmp_path','/tmp');  //接下来删除该单例对象,如果还能获取到刚刚添加的属性,说明使用的是同一个对象 unset($dbObj);  $dbObj = Database::getInstance();  echo $dbObj->getPeoperty('root_path');  echo $dbObj->getPeoperty('tmp_path');  
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    1.3 注册模式,全局共享和交换对象

  • 1.将同一个需要多次使用对象统一注册添加别名,统一调用使用, (比如客户买一个机器肯定是去工厂认定的机构去买,而不是每个人都去工厂去买)
  • 2.当下一次想使用一个对象的时候,不需要使用工厂,也不需要使用单例模式,直接在注册器上获取就可以了
  •     class Register (){        protected static $objects;        function set($alias, $object){            self::$objects[$alias] = $objects;        }        function get($alias){            return self::$objects[$alias];        }        function _unset($alias){            unset(self::$objects[$alias]);        }    }
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    2.总结使用

        class Factory{              static function getDatabase(){            //单例模式获取数据对象            $dbObj = Database::getInstance();            //注册到全局树上            Register::set('db1', $dbObj);        }    }    #使用    //第一次主文件里面    Factory::getDatabase();    //以后使用数据库对象直接访问    Register::get('db1');
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