<?php
 
class Registry {
  private static $_storage = array();
 
  public static function add($key, &$value) {
    if (self::exists($key)) {
      throw new Exception('Registry key "'.$key.'" already exists!');
    }
    self::$_storage[$key] = $value;
  }
 
  public static function & get($key) {
    if (array_key_exists($key, self::$_storage) {
      return self::$_storage[$key];
    }
    throw new Exception('Registry key "'.$key.'" not exists!');
  }
 
  public static function exists($key) {
    return isset(self::$_storage[$key]);
  }
}

<?php
 
$foo = new Foo(); // irgendein Objekt
$bar = 512;
 
// ablegen der Daten
Registry::add('foo', $foo);
Registry::add('bar', $bar);
...
 
// völlig andere Stelle innerhalb der Applikation
$foo = Registry::get('foo');
$bar = Registry::get('bar');