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<?php
/**
* Magic session class.
* This class is intended to extend the $_SESSION magic variable by providing an API hook
* to plug in other values.
*
* Primarily this is intended to provide a way of supplying "logged in user"
* details without touching the session (which can cause problems when
* accessed server side).
*
* If a value is present in the session then that value is returned, otherwise
* a plugin hook 'session:get', '$var' is called, where $var is the variable
* being requested.
*
* Setting values will store variables in the session in the normal way.
*
* LIMITATIONS: You can not access multidimensional arrays
*
* @package Elgg.Core
* @subpackage Sessions
*/
class ElggSession implements ArrayAccess {
/** Local cache of trigger retrieved variables */
private static $__localcache;
/**
* Test if property is set either as an attribute or metadata.
*
* @param string $key The name of the attribute or metadata.
*
* @return bool
*/
function __isset($key) {
return $this->offsetExists($key);
}
/**
* Set a value, go straight to session.
*
* @param string $key Name
* @param mixed $value Value
*
* @return void
*/
function offsetSet($key, $value) {
$_SESSION[$key] = $value;
}
/**
* Get a variable from either the session, or if its not in the session
* attempt to get it from an api call.
*
* @see ArrayAccess::offsetGet()
*
* @param mixed $key Name
*
* @return mixed
*/
function offsetGet($key) {
if (!ElggSession::$__localcache) {
ElggSession::$__localcache = array();
}
if (isset($_SESSION[$key])) {
return $_SESSION[$key];
}
if (isset(ElggSession::$__localcache[$key])) {
return ElggSession::$__localcache[$key];
}
$value = NULL;
$value = elgg_trigger_plugin_hook('session:get', $key, NULL, $value);
ElggSession::$__localcache[$key] = $value;
return ElggSession::$__localcache[$key];
}
/**
* Unset a value from the cache and the session.
*
* @see ArrayAccess::offsetUnset()
*
* @param mixed $key Name
*
* @return void
*/
function offsetUnset($key) {
unset(ElggSession::$__localcache[$key]);
unset($_SESSION[$key]);
}
/**
* Return whether the value is set in either the session or the cache.
*
* @see ArrayAccess::offsetExists()
*
* @param int $offset Offset
*
* @return bool
*/
function offsetExists($offset) {
if (isset(ElggSession::$__localcache[$offset])) {
return true;
}
if (isset($_SESSION[$offset])) {
return true;
}
if ($this->offsetGet($offset)) {
return true;
}
return false;
}
/**
* Alias to ::offsetGet()
*
* @param string $key Name
*
* @return mixed
*/
function get($key) {
return $this->offsetGet($key);
}
/**
* Alias to ::offsetSet()
*
* @param string $key Name
* @param mixed $value Value
*
* @return void
*/
function set($key, $value) {
$this->offsetSet($key, $value);
}
/**
* Alias to offsetUnset()
*
* @param string $key Name
*
* @return void
*/
function del($key) {
$this->offsetUnset($key);
}
}
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