php 3种基本设计模式的组合使用
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();
1.2 单例模式,使某个类的对象仅运行创建一个
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');
1.3 注册模式,全局共享和交换对象
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]); } }
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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