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<?php
/**
* SessionHandler:: implementation for DBM files.
* NOTE: The PHP DBM functions are deprecated.
*
* No additional configuration parameters needed.
*
* $Horde: framework/SessionHandler/SessionHandler/dbm.php,v 1.9.12.7 2006/01/01 21:28:34 jan Exp $
*
* Copyright 2002-2006 Chuck Hagenbuch <chuck@horde.org>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @author Chuck Hagenbuch <chuck@horde.org>
* @since Horde 3.0
* @package Horde_SessionHandler
*/
class SessionHandler_dbm extends SessionHandler {
/**
* Our pointer to the DBM file, if open.
*
* @var resource
*/
var $_dbm;
/**
* Open the SessionHandler backend.
*
* @param string $save_path The path to the session object.
* @param string $session_name The name of the session.
*
* @return boolean True on success, false otherwise.
*/
function open($save_path, $session_name)
{
$this->_dbm = @dbmopen("$save_path/$session_name", 'c');
return $this->_dbm;
}
/**
* Close the SessionHandler backend.
*
* @return boolean True on success, false otherwise.
*/
function close()
{
return @dbmclose($this->_dbm);
}
/**
* Read the data for a particular session identifier from the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return string The session data.
*/
function read($id)
{
if ($data = dbmfetch($this->_dbm, $id)) {
return base64_decode(substr($data, strpos($data, '|') + 1));
} else {
return '';
}
}
/**
* Write session data to the SessionHandler backend.
*
* @param string $id The session identifier.
* @param string $session_data The session data.
*
* @return boolean True on success, false otherwise.
*/
function write($id, $session_data)
{
return @dbmreplace($this->_dbm, $id, time() . '|' . base64_encode($session_data));
}
/**
* Destroy the data for a particular session identifier in the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return boolean True on success, false otherwise.
*/
function destroy($id)
{
if (!(@dbmdelete($this->_dbm, $id))) {
Horde::logMessage('Failed to delete session (id = ' . $id . ')', __FILE__, __LINE__, PEAR_LOG_ERR);
return false;
}
return true;
}
/**
* Garbage collect stale sessions from the SessionHandler backend.
*
* @param integer $maxlifetime The maximum age of a session.
*
* @return boolean True on success, false otherwise.
*/
function gc($maxlifetime = 300)
{
$expired = time() - $maxlifetime;
$id = dbmfirstkey($this->_dbm);
while ($id) {
if ($data = dbmfetch($this->_dbm, $id)) {
$age = substr($tmp, 0, strpos($data, '|'));
if ($expired > $age) {
$this->destroy($id);
}
}
$id = dbmnextkey($this->_dbm, $id);
}
return true;
}
}
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