Registry.inc.php

<?php
 
class Registry {
   static function &_getRegistry() {
      static $registry = array();
      return $registry;
   }
 
   static function &get($key, $createIfEmpty = false, $createWithDefault = null) {
      $registry =& Registry::_getRegistry();
 
      $result = null;
      if (isset($registry[$key])) $result =& $registry[$key];
      elseif ($createIfEmpty) {
         $result = $createWithDefault;
         Registry::set($key, $result);
      }
      return $result;
   }
 
   static function set($key, &$value) {
      $registry =& Registry::_getRegistry();
      $registry[$key] =& $value;
   }
 
   static function delete($key) {
      $registry =& Registry::_getRegistry();
      if (isset($registry[$key])) {
         unset($registry[$key]);
      }
   }
 
   static function clear() {
      $registry =& Registry::_getRegistry();
      foreach (array_keys($registry) as $key) {
         unset($registry[$key]);
      }
   }
}