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<?php
//
// +----------------------------------------------------------------------+
// | PEAR :: Cache |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Richard Heyes <richard@phpguru.org> |
// +----------------------------------------------------------------------+
//
// $Id: Application.php,v 1.5 2003/01/04 11:54:45 mj Exp $
require_once 'Cache.php';
// Application level variables
//
// Purpose
// Variables that are persisent across all user sessions,
// not just a specific user ala normal sessions.
//
// Usage:
//
// Example 1:
//
// $app =& new Cache_Application();
// $_APP =& $app->getData();
//
// In this case the $_APP variable is akin to the $_SESSION variable.
// If you add/remove stuff, it will be reflected in the next request
// (of any user).
//
// Example 2:
//
// $foo = 'Some data';
// $bar = 'Some other data';
//
// $app =& new Cache_Application();
// $app->register('foo');
// $app->register('bar', $bar);
//
// $foo = 'Different data';
//
// In this case the variables are registered with the register() function.
// This is akin to session_register().
//
// As with session_register(), the contents of the variable at the *end* of the
// request is registered and not at the point of registration. Therefore in this
// example, for the $foo variable, the string 'Different data' is stored and not
// 'Some data'. The exception to this rule is if you use the second argument to
// register() as in the second call to it above. This will cause the data supplied
// in the second argument to be stored and not the contents at the end of the request.
//
// Note: If you use this method with register_globals turned on, the variables will be
// automatically globalled upon startup, (ie. when you create the object).
//
// Note: If you register a variable that is not set when the script finishes, it will
// registered as NULL.
//
//
// *** You are strongly recommended to use only one method of the two above. ***
//
// (In fact if you use the register() function with register_globals Off, you have to
// use the $_APP method to get at the data).
class Cache_Application extends Cache {
var $data;
var $id;
var $group;
var $registered_vars;
/**
* Constructor
*
* @param string Name of container class
* @param array Array with container class options
*/
function Cache_Application($container = 'file', $container_options = array('cache_dir' => '/tmp/', 'filename_prefix' => 'cache_'), $id = 'application_var', $group = 'application_cache')
{
$this->id = $id;
$this->group = $group;
$this->registered_vars = array();
$this->Cache($container, $container_options);
$this->data = $this->isCached($this->id, $this->group) ? unserialize($this->get($this->id, $this->group)) : array();
// If register_globals on, global all registered variables
if (ini_get('register_globals') AND is_array($this->data)) {
foreach ($this->data as $key => $value) {
global $$key;
$$key = $value;
}
}
}
/**
* Destructor
*
* Gets values of all registered variables and stores them. Then calls save() to
* write data away.
*/
function _Cache_Application()
{
// Get contents of all registered variables
if (is_array($this->registered_vars) AND !empty($this->registered_vars)) {
foreach ($this->registered_vars as $varname) {
global $$varname;
$this->data[$varname] = $$varname;
}
}
// Save the data
$this->save($this->id, serialize($this->data), 0, $this->group);
}
/**
* register()
*
* Registers a variable to be stored.
*
* @param string Name of variable to register
* @param mixed Optional data to store
*/
function register($varname, $data = null)
{
if (isset($data)) {
$this->data[$varname] = $data;
} else {
$this->registered_vars[] = $varname;
}
}
/**
* unregister()
*
* Unregisters a variable from being stored.
*
* @param string Name of variable to unregister
*/
function unregister($varname)
{
if (isset($this->data[$varname])) {
unset($this->data[$varname]);
}
}
/**
* clear()
*
* Removes all stored data
*/
function clear()
{
$this->data = array();
}
/**
* getData()
*
* Use this to get a reference to the data to manipulate
* in calling script. Eg. $_APP =& $obj->getData();
*
* @return mixed A reference to the data
*/
function &getData()
{
return $this->data;
}
}
?>
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