深入分析PHP设计模式

<?php
class test{
  protected function __construct(){
  }

  public static function getInstance(){
    $_test = new test();
    return $_test;
  }
}
$test = test::getInstance();
var_dump($test);
? 

interface mysql{ 
  public function connect();
}
 
class mysqli2 implements mysql{
  public function connect(){
    echo 'mysqli';
  }
}
 
class pdo2 implements mysql{
  public function connect(){
    echo 'pdo';
  }
}

class mysqlFactory{
  static public function factory($class_name){
    return new $class_name();
  }
}
$obj = mysqlFactory::factory('pdo2');
$obj- connect();

<?php
class Register
{
    protected static $objects;
    function set($alias,$object)//将对象注册到全局的树上
    {
      self::$objects[$alias]=$object;//将对象放到树上
    }
    static function get($name){
      return self::$objects[$name];//获取某个注册到树上的对象
     }
  function _unset($alias)
　　{
     unset(self::$objects[$alias]);//移除某个注册到树上的对象。
    }
}

\Auto\Register::set('single',$single);
$single = \Auto\Register::get('single');
var_dump($single);

//目标角色
interface Aims
{
  public function newMethod1();
  public function newMethod2();
}
 
//需要被适配的类(Adaptee)
Class Man
{
  public function oldMethod1()
  {
    echo 'man';
  }
 
  public function oldMethod2()
  {
    echo '男人';
  }
}
 
//需要被适配的类(Adaptee)
Class Woman
{
  public function oldMethod1()
  {
    echo 'woman';
  }
 
  public function oldMethod2()
  {
    echo '女人';
  }
}
 
//适配器，
Class Adapters implements Aims
{
  private $adaptee;
  public function __construct($adaptee)
  {
    $this- adaptee = $adaptee;
  }
 
  public function newMethod1()
  {
    //以少量的代码对被适配者作出适配
    echo 'sex :';
    $this- adaptee- oldMethod1();
  }
 
  public function newMethod2()
  {
    echo 'sex name :';
    $this- adaptee- oldMethod2();
  }
}
 
$adapter1 = new Adapters(new Man);
$adapter1- newMethod1();
$adapter2 = new Adapters(new Woman);
$adapter2- newMethod2();

UserStrategy.php
<?php
/*
 * 声明策略文件的接口，约定策略包含的行为。
 */
interface UserStrategy
{
  function showAd();
  function showCategory();
}

FemaleUser.php
<?php
class FemaleUser implements UserStrategy
{
  function showAd(){
    echo "2016冬季女装";
  }
  function showCategory(){
    echo "女装";
  }
}

MaleUser.php
<?php
class MaleUser implements UserStrategy
{
  function showAd(){
    echo "IPhone6s";
  }
  function showCategory(){
    echo "电子产品";
  }
}

Page.php//执行文件
<?php
require_once 'Loader.php';
class Page
{
  protected $strategy;
  function index(){
    echo "AD";
    $this- strategy- showAd();
    echo "<br ";
    echo "Category";
    $this- strategy- showCategory();
    echo "<br ";
  }
  function setStrategy(UserStrategy $strategy){
    $this- strategy=$strategy;
  }
}

$page = new Page();
if(isset($_GET['male'])){
  $strategy = new MaleUser();
}else {
  $strategy = new FemaleUser();
}
$page- setStrategy($strategy);
$page- index();

/**
 * 事件产生类
 * Class EventGenerator
 */
abstract class EventGenerator
{
  private $ObServers = [];

  //增加观察者
  public function add(ObServer $ObServer)
  {
    $this- ObServers[] = $ObServer;
  }

  //事件通知
  public function notify()
  {
    foreach ($this- ObServers as $ObServer) {
      $ObServer- update();
    }
  }

}

/**
 * 观察者接口类
 * Interface ObServer
 */
interface ObServer
{
  public function update($event_info = null);
}

/**
 * 观察者1
 */
class ObServer1 implements ObServer
{
  public function update($event_info = null)
  {
    echo "观察者1 收到执行通知 执行完毕！\n";
  }
}

/**
 * 观察者1
 */
class ObServer2 implements ObServer
{
  public function update($event_info = null)
  {
    echo "观察者2 收到执行通知 执行完毕！\n";
  }
}

/**
 * 事件
 * Class Event
 */
class Event extends EventGenerator
{
  /**
   * 触发事件
   */
  public function trigger()
  {
    //通知观察者
    $this- notify();
  }
}

//创建一个事件
$event = new Event();
//为事件增加旁观者
$event- add(new ObServer1());
$event- add(new ObServer2());
//执行事件 通知旁观者
$event- trigger();