PHP常用设计模式

class Single { ???public $rand; ???static private $instance; // 类直接调用 ???final private function __construct() { // private防止外部new ???????$this->rand = mt_rand(1, 100); ???} ???static public function getInstance() { ???????if (!self::$instance) { // 判断$instance是否赋值 ???????????self::$instance = new self; ???????} ???????return self::$instance; ????}}$obj1 = Single::getInstance();$obj2 = Single::getInstance();var_dump($obj1 === $obj2); // true

//接单例模式代码class FactoryClass { ???static public function factory() { ???????return Single::getInstance(); ???}}var_dump(FactoryClass::factory());

class Register { ???static protected $objects; //全局树array ???static public function set($alias, $object) { ???????self::$objects[$alias] = $object; //设置 ???} ???static public function get($alias) { ???????return self::$objects[$alias]; //获取 ???} ???static public function _unset($alias) { ???????unset(self::$objects[$alias]); //注销 ???}}Register::set(‘rand‘, FactoryClass::factory()); //设置别名为rand的对象var_dump(Register::get(‘rand‘)); //获取别名为rand的对象Register::_unset(‘rand‘); ??//销毁别名为rand的对象var_dump(Register::get(‘rand‘)); //Notice: Undefined index: rand 

//类适配器使用的是继承/** * 目标 */interface Target { ???public function method1(); //源类也有的方法1 ???public function method2(); //源类没有的方法2}/** * 源 */class Source { ???public function method1() { ???????echo ‘我是源类含有的方法一 <br>‘; ???}}/** * 类适配器 */class Adapter extends Source implements Target { ???public function method2() { ???????echo ‘我是适配器补充的方法二 <br>‘; ???}}/** * 客户端 */class Client { ???static public function main() { ???????$adapter = new Adapter(); ???????$adapter->method1(); ???????$adapter->method2(); ???}}Client::main();

//类适配器使用的是继承/** * 目标 */interface Target { ???public function method1(); //源类也有的方法1 ???public function method2(); //源类没有的方法2}/** * 源 */class Source { ???public function method1() { ???????echo ‘我是源类含有的方法一 <br>‘; ???}}/** * 类适配器 */class Adapter implements Target { ???private $_source; ???public function __construct(Source $source) { ???????$this->_source = $source; ???} ???public function method1() { //委派调用source的method1方法 ???????$this->_source->method1(); ???} ???public function method2() { //补充source中没有的method2方法 ???????echo ‘我是适配器补充的方法二‘; ????}}class Client { ???static public function main() { ???????$adapter = new Adapter(new Source); ???????$adapter->method1(); ???????$adapter->method2(); ???}}Client::main(); //我是源类含有的方法一 //我是适配器补充的方法二

/** * 主题接口 */interface Subject { ???public function register(Observer $observer); //注册对象方法 ???public function notify(); //通知方法}/** * 观察者接口 */interface Observer { ???public function update();}/** * 执行类 */class Action implements Subject { ???private $_observers = array(); ???public function register(Observer $observer) { ???????$this->_observers[] = $observer; //对象写入 ???} ???public function notify() { ???????foreach ($this->_observers as $observer) { //遍历对象 ???????????$observer->update(); ???????????????????} ???}}/** * 观察者 */class Man implements Observer { ???public function update() { ???????echo ‘man观察者<br>‘; ???}}class Woman implements Observer { ???public function update() { ???????echo ‘woman观察者‘; ???}}$action = new Action();$action->register(new Man);$action->register(new Woman);$action->notify();