<?php
/**
* A minimal sessions++ stack component
* Does nothing except calling the next in the chain
*/
if (!defined('E_USER_DEBUG')) {
define('E_USER_DEBUG',0);
}
class stackSess {
public $shStackNext;
/**
* Its important for all tiers in the stack to know the
* last mod time on the session. The $lastAccess member
* variable MUST be populated by the
* read method
*/
public $lastAccess;
/**
* allows the injection of a custom logger
* %%%% needs update to PSR
*/
public $logger;
function __construct($shNext=false)
{
if (false!==$shNext) {
$this->addNext($shNext);
}
}
function setLogger($logr)
{
$this->logger=$logr;
$this->logit(get_class($this) . "::setLogger() installed logger",E_USER_DEBUG);
}
function lastAccessed($lastAccess=false)
{
if ($this->shNext && is_callable(array($this->shNext, 'lastAccessed'))) {
$lastAccess=$this->shNext->lastAccessed($lastAccess);
}
return $lastAccess;
}
function install()
{
$this->logit(get_class($this) . "::install", E_USER_DEBUG);
if (version_compare(PHP_VERSION, '5.5.1') >=0) {
return session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'read'),
array($this, 'write'),
array($this, 'destroy'),
array($this, 'gc'),
array($this, 'create_sid')
);
} else {
$this->logit(get_class($this) . "::install() This version of PHP does not have a hook for create_sid", E_USER_NOTICE);
return session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'read'),
array($this, 'write'),
array($this, 'destroy'),
array($this, 'gc') /*,
array($this, 'create_sid')*/
);
}
}
function logit($msg)
{
if (is_callable($this->logger)) {
return call_user_func($this->logger,$msg);
}
return false;
}
function close ()
{
if ($this->shStackNext) {
return $this->shStackNext->close();
} else {
return false;
}
}
function destroy($session_id)
{
if ($this->shStackNext) {
return $this->shStackNext->destroy($session_id);
} else {
return false;
}
}
function gc($maxlifetime)
{
if ($this->shStackNext) {
return $this->shStackNext->gc($maxlifetime);
} else {
return false;
}
}
function open($save_path, $name)
{
if ($this->shStackNext) {
return $this->shStackNext->open($save_path, $name);
} else {
$this->logit(get_class($this) . "::open() No storage handler at botton of session stack!", E_USER_ERROR);
return false;
}
}
function read($session_id)
{
if ($this->shStackNext) {
return $this->shStackNext->read($session_id);
} else {
return $session_str;
}
}
function write($session_id, $session_data)
{
if ($this->shStackNext) {
return $this->shStackNext->write($session_id, $session_data);
} else {
return $session_str;
}
}
function create_sid($newlyCreatedSid=false)
{
$this->logit(get_class($this) . "::create_sid() called", E_USER_DEBUG);
if (is_callable(array($this->shStackNext,'create_sid'))) {
// we always send down the stack
$newlyCreatedSid=$this->shStackNext->create_sid($newlyCreatedSid);
} else if (false==$newlyCreatedSid) {
$newlyCreatedSid=uniqid('', true);
}
return $newlyCreatedSid;
}
/**
* Adds a session++ handler below this one
*
*/
function addNext($shNext)
{
if (false==$shNext || is_callable(array($shNext, 'gc'))) {
$this->shStackNext=$shNext;
} else {
trigger_error("Each entry in the session stack must have sessp as a parent", E_USER_ERROR);
}
}
/**
* returns the class names in the stack of session handlers
* below (and including) this one (deepest first
*/
function getStack()
{
if ($this->shStackNext) {
$stack=$this->shStackNext->getStack();
} else {
$stack=array();
}
array_push($stack,array(
'class'=>get_class(),
'instance'=>$this
));
return $stack;
}
}
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