php中注册器模式类用法实例分析

<?php
/** 
 * 注册器读写类 
 */
class registry extends arrayobject
{
  /** 
   * registry实例
   *
   * @var object 
   */
  private static $_instance = null;
  /**
   * 取得registry实例
   * 
   * @note 单件模式
   * 
   * @return object
   */
  public static function getinstance()
  {
    if (self::$_instance === null) {
      self::$_instance = new self();
      echo "new register object!";
    }
    return self::$_instance;
  }
  /**
   * 保存一项内容到注册表中
   * 
   * @param string $name 索引
   * @param mixed $value 数据
   * 
   * @return void
   */
  public static function set($name, $value)
  {
    self::getinstance()->offsetset($name, $value);
  }
  /**
   * 取得注册表中某项内容的值
   * 
   * @param string $name 索引
   * 
   * @return mixed
   */
  public static function get($name)
  {
    $instance = self::getinstance();
    if (!$instance->offsetexists($name)) {
      return null;
    }
    return $instance->offsetget($name);
  }
  /**
   * 检查一个索引是否存在 
   * 
   * @param string $name 索引
   * 
   * @return boolean
   */
  public static function isregistered($name)
  {
    return self::getinstance()->offsetexists($name);
  }
  /**
   * 删除注册表中的指定项
   * 
   * @param string $name 索引
   * 
   * @return void
   */
  public static function remove($name)
  {
    self::getinstance()->offsetunset($name);
  }
}

<?php
class test
{
   function hello()
   {
    echo "hello world";
    return;
   }
} 
?>

<?php
//引入相关类
require_once "registry.class.php";
require_once "test.class.php";
//new a object
$test=new test();
//$test->hello();
//注册对象
registry::set('testclass',$test);
//取出对象
$t = registry::get('testclass');
//调用对象方法
$t->hello();
?>