CodeIgniter默认将session保存到cookie里，为了实现session共享，需要将session保存到memcached中，具体实现方法如下：
1、新建一个配置文件
vim application/config/memcache.php
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
$config['memcache'] = array(
'hostname'=>'192.168.1.198',
'port'=>'10000',
'weight'=>1
);2、新建一个MY_Session的类vim application/libraries/MY_Session.php
<?php defined('BASEPATH') OR exit('No direct script access allowed');
new Cache_Session_Handler;
session_start();
Class MY_Session Extends CI_Session
{
public function __construct($params = array())
{
parent::__construct($params);
}
public function sess_read()
{
$session = $_SESSION;
if ( ! is_array($session) OR ! isset($session['session_id']) OR ! isset($session['ip_address']) OR ! isset($session['user_agent']) OR ! isset($session['last_activity']))
{
log_message('debug', 'A session was not found.');
$this->sess_destroy(FALSE);
return FALSE;
}
if (($session['last_activity'] + $this->sess_expiration) < $this->now)
{
$this->sess_destroy(FALSE);
return FALSE;
}
if ($this->sess_match_ip == TRUE AND $session['ip_address'] != $this->CI->input->ip_address())
{
$this->sess_destroy(FALSE);
return FALSE;
}
if ($this->sess_match_useragent == TRUE AND trim($session['user_agent']) != trim(substr($this->CI->input->user_agent(), 0, 120)))
{
$this->sess_destroy(FALSE);
return FALSE;
}
$this->userdata = $session;
unset($session);
return TRUE;
}
public function sess_write()
{
$_SESSION = array();
foreach($this->userdata as $key => $val)
{
$_SESSION[$key] = $val;
}
}
public function sess_create()
{
if(session_id() == '')
{
session_start();
}
$_SESSION['session_id'] = session_id();
$_SESSION['ip_address'] = $this->CI->input->ip_address();
$_SESSION['user_agent'] = substr($this->CI->input->user_agent(), 0, 120);
$_SESSION['last_activity'] = $this->now;
$this->userdata = $_SESSION;
}
public function sess_update()
{
if( !$this->sess_update && (($this->userdata['last_activity'] + $this->sess_time_to_update) >= $this->now) )
{
return;
}
session_regenerate_id();
$_SESSION['session_id'] = session_id();
$_SESSION['last_activity'] = $this->now;
}
public function sess_destroy($destroy = TRUE)
{
session_unset();
session_regenerate_id();
if($destroy)
{
session_destroy();
}
}
public function _sess_gc(){}
}
class Cache_Session_Handler
{
private $_lifetime = 0;
private $_CI;
public function __construct()
{
session_name(config_item('sess_cookie_name'));
session_set_save_handler(
array($this, "open"),
array($this, "close"),
array($this, "read"),
array($this, "write"),
array($this, "destroy"),
array($this, "gc")
);
$this->_CI = & get_instance();
ini_set("session.cookie_domain",config_item('cookie_domain'));
ini_set("session.cookie_lifetime",config_item('sess_expiration'));
if( ! $this->_CI->load->is_loaded('cache'))
{
//使用memcache作为cache
$this->_CI->load->driver(
'cache',
array('adapter' => 'memcache', 'backup' => 'file'
));
}
}
public function open()
{
$this->_lifetime = ini_get('session.gc_maxlifetime');
if($this->_lifetime <= config_item('sess_expiration'))
{
$this->_lifetime = config_item('sess_expiration');
}
return TRUE;
}
public function read($id)
{
return $this->_CI->cache->get("sess_{$id}");
}
public function write($id, $data)
{
return $this->_CI->cache->replace("sess_{$id}", $data, $this->_lifetime);
}
public function destroy($id)
{
return $this->_CI->cache->delete("sess_{$id}");
}
public function gc()
{
return TRUE;
}
public function close()
{
return TRUE;
}
public function __destruct()
{
session_write_close();
}
}3、替换system/libraries/Cache/Cache.php文件
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 4.3.2 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2006 - 2011 EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 2.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* CodeIgniter Caching Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Core
* @author ExpressionEngine Dev Team
* @link
*/
class CI_Cache extends CI_Driver_Library {
protected $valid_drivers = array(
'cache_apc', 'cache_file', 'cache_memcached', 'cache_memcache', 'cache_dummy'
);
protected $_cache_path = NULL; // Path of cache files (if file-based cache)
protected $_adapter = 'dummy';
protected $_backup_driver;
// ------------------------------------------------------------------------
/**
* Constructor
*
* @param array
*/
public function __construct($config = array())
{
if ( ! empty($config))
{
$this->_initialize($config);
}
}
// ------------------------------------------------------------------------
/**
* Get
*
* Look for a value in the cache. If it exists, return the data
* if not, return FALSE
*
* @param string
* @return mixed value that is stored/FALSE on failure
*/
public function get($id)
{
return $this->{$this->_adapter}->get($id);
}
// ------------------------------------------------------------------------
/**
* Cache Save
*
* @param string Unique Key
* @param mixed Data to store
* @param int Length of time (in seconds) to cache the data
*
* @return boolean true on success/false on failure
*/
public function save($id, $data, $ttl = 60)
{
return $this->{$this->_adapter}->save($id, $data, $ttl);
}
// ------------------------------------------------------------------------
/**
* Cache Replace
*
* @param string Unique Key
* @param mixed Data to store
* @param int Length of time (in seconds) to cache the data
*
* @return boolean true on success/false on failure
*/
public function replace($id, $data, $ttl = 60)
{
return $this->{$this->_adapter}->replace($id, $data, $ttl);
}
// ------------------------------------------------------------------------
/**
* Delete from Cache
*
* @param mixed unique identifier of the item in the cache
* @return boolean true on success/false on failure
*/
public function delete($id)
{
return $this->{$this->_adapter}->delete($id);
}
// ------------------------------------------------------------------------
/**
* Clean the cache
*
* @return boolean false on failure/true on success
*/
public function clean()
{
return $this->{$this->_adapter}->clean();
}
// ------------------------------------------------------------------------
/**
* Cache Info
*
* @param string user/filehits
* @return mixed array on success, false on failure
*/
public function cache_info($type = 'user')
{
return $this->{$this->_adapter}->cache_info($type);
}
// ------------------------------------------------------------------------
/**
* Get Cache Metadata
*
* @param mixed key to get cache metadata on
* @return mixed return value from child method
*/
public function get_metadata($id)
{
return $this->{$this->_adapter}->get_metadata($id);
}
// ------------------------------------------------------------------------
/**
* Initialize
*
* Initialize class properties based on the configuration array.
*
* @param array
* @return void
*/
private function _initialize($config)
{
$default_config = array(
'adapter',
'memcached'
);
foreach ($default_config as $key)
{
if (isset($config[$key]))
{
$param = '_'.$key;
$this->{$param} = $config[$key];
}
}
if (isset($config['backup']))
{
if (in_array('cache_'.$config['backup'], $this->valid_drivers))
{
$this->_backup_driver = $config['backup'];
}
}
if( ! $this->{$this->_adapter}->is_supported())
{
$this->_adapter = $this->_backup_driver;
}
}
// ------------------------------------------------------------------------
/**
* Is the requested driver supported in this environment?
*
* @param string The driver to test.
* @return array
*/
public function is_supported($driver)
{
static $support = array();
if ( ! isset($support[$driver]))
{
$support[$driver] = $this->{$driver}->is_supported();
}
return $support[$driver];
}
// ------------------------------------------------------------------------
/**
* __get()
*
* @param child
* @return object
*/
public function __get($child)
{
$obj = parent::__get($child);
if ( ! $this->is_supported($child))
{
$this->_adapter = $this->_backup_driver;
}
return $obj;
}
// ------------------------------------------------------------------------
}
// End Class
/* End of file Cache.php */
/* Location: ./system/libraries/Cache/Cache.php */4、新建Cache_memcache.phpvim system/libraries/Cache/drivers/Cache_memcache.php
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class CI_Cache_memcache extends CI_Driver {
private $_memcache;
protected $_memcache_conf = array(
'default' => array(
'default_host' => '127.0.0.1',
'default_port' => 11211,
'default_weight' => 1
)
);
public function get($id)
{
$data = @$this->_memcache->get($id);
return (is_array($data)) ? $data[0] : FALSE;
}
public function save($id, $data, $ttl = 60)
{
return $this->_memcache->add($id, array($data, time(), $ttl), 0, $ttl);
}
public function replace($id, $data, $ttl = 60)
{
$result = $this->_memcache->replace($id, array($data, time(), $ttl), 0, $ttl);
if($result === FALSE)
{
$result = $this->save($id, $data, $ttl);
}
return $result;
}
public function delete($id)
{
return $this->_memcache->delete($id);
}
public function clean()
{
return $this->_memcache->flush();
}
public function cache_info($type = NULL)
{
return $this->_memcache->getStats();
}
public function get_metadata($id)
{
$stored = $this->_memcache->get($id);
if (count($stored) !== 3)
{
return FALSE;
}
list($data, $time, $ttl) = $stored;
return array(
'expire' => $time + $ttl,
'mtime' => $time,
'data' => $data
);
}
private function _setup_memcached()
{
$CI =& get_instance();
if ($CI->config->load('memcache', FALSE, TRUE))
{
if (is_array($CI->config->config['memcache']))
{
$this->_memcache_conf = NULL;
foreach ($CI->config->config['memcache'] as $name => $conf)
{
$this->_memcache_conf[$name] = $conf;
}
}
}
$this->_memcache = new Memcache;
$cache_server = $this->_memcache_conf;
if ( ! array_key_exists('hostname', $cache_server))
{
$cache_server['hostname'] = $this->_default_options['default_host'];
}
if ( ! array_key_exists('port', $cache_server))
{
$cache_server['port'] = $this->_default_options['default_port'];
}
if ( ! array_key_exists('weight', $cache_server))
{
$cache_server['weight'] = $this->_default_options['default_weight'];
}
$this->_memcache->addServer(
$cache_server['hostname'], $cache_server['port'], $cache_server['weight']
);
}
public function is_supported()
{
if ( ! extension_loaded('memcache'))
{
log_message('debug', 'The Memcache Extension must be loaded to use Memcache Cache.');
return FALSE;
}
$this->_setup_memcached();
return TRUE;
}
}5、更新session.php文件
vim system/libraries/Session.php
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Session Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Sessions
* @author ExpressionEngine Dev Team
* @link http://codeigniter.com/user_guide/libraries/sessions.html
*/
class CI_Session {
var $sess_encrypt_cookie = FALSE;
var $sess_use_database = FALSE;
var $sess_table_name = '';
var $sess_expiration = 7200;
var $sess_expire_on_close = FALSE;
var $sess_match_ip = FALSE;
var $sess_match_useragent = TRUE;
var $sess_cookie_name = 'ci_session';
var $cookie_prefix = '';
var $cookie_path = '';
var $cookie_domain = '';
var $cookie_secure = FALSE;
var $sess_update = TRUE;
var $sess_time_to_update = 300;
var $encryption_key = '';
var $flashdata_key = 'flash';
var $time_reference = 'time';
var $gc_probability = 5;
var $userdata = array();
var $CI;
var $now;
/**
* Session Constructor
*
* The constructor runs the session routines automatically
* whenever the class is instantiated.
*/
public function __construct($params = array())
{
log_message('debug', "Session Class Initialized");
// Set the super object to a local variable for use throughout the class
$this->CI =& get_instance();
// Set all the session preferences, which can either be set
// manually via the $params array above or via the config file
foreach (array('sess_encrypt_cookie', 'sess_use_database', 'sess_table_name', 'sess_expiration', 'sess_expire_on_close', 'sess_match_ip', 'sess_match_useragent', 'sess_cookie_name', 'cookie_path', 'cookie_domain', 'cookie_secure', 'sess_update', 'sess_time_to_update', 'time_reference', 'cookie_prefix', 'encryption_key') as $key)
{
$this->$key = (isset($params[$key])) ? $params[$key] : $this->CI->config->item($key);
}
if ($this->encryption_key == '')
{
show_error('In order to use the Session class you are required to set an encryption key in your config file.');
}
// Load the string helper so we can use the strip_slashes() function
$this->CI->load->helper('string');
// Do we need encryption? If so, load the encryption class
if ($this->sess_encrypt_cookie == TRUE)
{
$this->CI->load->library('encrypt');
}
// Are we using a database? If so, load it
if ($this->sess_use_database === TRUE AND $this->sess_table_name != '')
{
$this->CI->load->database();
}
// Set the "now" time. Can either be GMT or server time, based on the
// config prefs. We use this to set the "last activity" time
$this->now = $this->_get_time();
// Set the session length. If the session expiration is
// set to zero we'll set the expiration two years from now.
if ($this->sess_expiration == 0)
{
$this->sess_expiration = (60*60*24*365*2);
}
// Set the cookie name
$this->sess_cookie_name = $this->cookie_prefix.$this->sess_cookie_name;
// Run the Session routine. If a session doesn't exist we'll
// create a new one. If it does, we'll update it.
if ( ! $this->sess_read())
{
$this->sess_create();
}
else
{
$this->sess_update();
}
// Delete 'old' flashdata (from last request)
$this->_flashdata_sweep();
// Mark all new flashdata as old (data will be deleted before next request)
$this->_flashdata_mark();
// Delete expired sessions if necessary
$this->_sess_gc();
log_message('debug', "Session routines successfully run");
}
// --------------------------------------------------------------------
/**
* Fetch the current session data if it exists
*
* @access public
* @return bool
*/
function sess_read()
{
// Fetch the cookie
$session = $this->CI->input->cookie($this->sess_cookie_name);
// No cookie? Goodbye cruel world!...
if ($session === FALSE)
{
log_message('debug', 'A session cookie was not found.');
return FALSE;
}
// Decrypt the cookie data
if ($this->sess_encrypt_cookie == TRUE)
{
$session = $this->CI->encrypt->decode($session);
}
else
{
// encryption was not used, so we need to check the md5 hash
$hash = substr($session, strlen($session)-32); // get last 32 chars
$session = substr($session, 0, strlen($session)-32);
// Does the md5 hash match? This is to prevent manipulation of session data in userspace
if ($hash !== md5($session.$this->encryption_key))
{
log_message('error', 'The session cookie data did not match what was expected. This could be a possible hacking attempt.');
$this->sess_destroy();
return FALSE;
}
}
// Unserialize the session array
$session = $this->_unserialize($session);
// Is the session data we unserialized an array with the correct format?
if ( ! is_array($session) OR ! isset($session['session_id']) OR ! isset($session['ip_address']) OR ! isset($session['user_agent']) OR ! isset($session['last_activity']))
{
$this->sess_destroy();
return FALSE;
}
// Is the session current?
if (($session['last_activity'] + $this->sess_expiration) < $this->now)
{
$this->sess_destroy();
return FALSE;
}
// Does the IP Match?
if ($this->sess_match_ip == TRUE AND $session['ip_address'] != $this->CI->input->ip_address())
{
$this->sess_destroy();
return FALSE;
}
// Does the User Agent Match?
if ($this->sess_match_useragent == TRUE AND trim($session['user_agent']) != trim(substr($this->CI->input->user_agent(), 0, 120)))
{
$this->sess_destroy();
return FALSE;
}
// Is there a corresponding session in the DB?
if ($this->sess_use_database === TRUE)
{
$this->CI->db->where('session_id', $session['session_id']);
if ($this->sess_match_ip == TRUE)
{
$this->CI->db->where('ip_address', $session['ip_address']);
}
if ($this->sess_match_useragent == TRUE)
{
$this->CI->db->where('user_agent', $session['user_agent']);
}
$query = $this->CI->db->get($this->sess_table_name);
// No result? Kill it!
if ($query->num_rows() == 0)
{
$this->sess_destroy();
return FALSE;
}
// Is there custom data? If so, add it to the main session array
$row = $query->row();
if (isset($row->user_data) AND $row->user_data != '')
{
$custom_data = $this->_unserialize($row->user_data);
if (is_array($custom_data))
{
foreach ($custom_data as $key => $val)
{
$session[$key] = $val;
}
}
}
}
// Session is valid!
$this->userdata = $session;
unset($session);
return TRUE;
}
// --------------------------------------------------------------------
/**
* Write the session data
*
* @access public
* @return void
*/
function sess_write()
{
// Are we saving custom data to the DB? If not, all we do is update the cookie
if ($this->sess_use_database === FALSE)
{
$this->_set_cookie();
return;
}
// set the custom userdata, the session data we will set in a second
$custom_userdata = $this->userdata;
$cookie_userdata = array();
// Before continuing, we need to determine if there is any custom data to deal with.
// Let's determine this by removing the default indexes to see if there's anything left in the array
// and set the session data while we're at it
foreach (array('session_id','ip_address','user_agent','last_activity') as $val)
{
unset($custom_userdata[$val]);
$cookie_userdata[$val] = $this->userdata[$val];
}
// Did we find any custom data? If not, we turn the empty array into a string
// since there's no reason to serialize and store an empty array in the DB
if (count($custom_userdata) === 0)
{
$custom_userdata = '';
}
else
{
// Serialize the custom data array so we can store it
$custom_userdata = $this->_serialize($custom_userdata);
}
// Run the update query
$this->CI->db->where('session_id', $this->userdata['session_id']);
$this->CI->db->update($this->sess_table_name, array('last_activity' => $this->userdata['last_activity'], 'user_data' => $custom_userdata));
// Write the cookie. Notice that we manually pass the cookie data array to the
// _set_cookie() function. Normally that function will store $this->userdata, but
// in this case that array contains custom data, which we do not want in the cookie.
$this->_set_cookie($cookie_userdata);
}
// --------------------------------------------------------------------
/**
* Create a new session
*
* @access public
* @return void
*/
function sess_create()
{
$sessid = '';
while (strlen($sessid) < 32)
{
$sessid .= mt_rand(0, mt_getrandmax());
}
// To make the session ID even more secure we'll combine it with the user's IP
$sessid .= $this->CI->input->ip_address();
$this->userdata = array(
'session_id' => md5(uniqid($sessid, TRUE)),
'ip_address' => $this->CI->input->ip_address(),
'user_agent' => substr($this->CI->input->user_agent(), 0, 120),
'last_activity' => $this->now,
'user_data' => ''
);
// Save the data to the DB if needed
if ($this->sess_use_database === TRUE)
{
$this->CI->db->query($this->CI->db->insert_string($this->sess_table_name, $this->userdata));
}
// Write the cookie
$this->_set_cookie();
}
// --------------------------------------------------------------------
/**
* Update an existing session
*
* @access public
* @return void
*/
function sess_update()
{
// We only update the session every five minutes by default
if (($this->userdata['last_activity'] + $this->sess_time_to_update) >= $this->now)
{
return;
}
// Save the old session id so we know which record to
// update in the database if we need it
$old_sessid = $this->userdata['session_id'];
$new_sessid = '';
while (strlen($new_sessid) < 32)
{
$new_sessid .= mt_rand(0, mt_getrandmax());
}
// To make the session ID even more secure we'll combine it with the user's IP
$new_sessid .= $this->CI->input->ip_address();
// Turn it into a hash
$new_sessid = md5(uniqid($new_sessid, TRUE));
// Update the session data in the session data array
$this->userdata['session_id'] = $new_sessid;
$this->userdata['last_activity'] = $this->now;
// _set_cookie() will handle this for us if we aren't using database sessions
// by pushing all userdata to the cookie.
$cookie_data = NULL;
// Update the session ID and last_activity field in the DB if needed
if ($this->sess_use_database === TRUE)
{
// set cookie explicitly to only have our session data
$cookie_data = array();
foreach (array('session_id','ip_address','user_agent','last_activity') as $val)
{
$cookie_data[$val] = $this->userdata[$val];
}
$this->CI->db->query($this->CI->db->update_string($this->sess_table_name, array('last_activity' => $this->now, 'session_id' => $new_sessid), array('session_id' => $old_sessid)));
}
// Write the cookie
$this->_set_cookie($cookie_data);
}
// --------------------------------------------------------------------
/**
* Destroy the current session
*
* @access public
* @return void
*/
function sess_destroy()
{
// Kill the session DB row
if ($this->sess_use_database === TRUE && isset($this->userdata['session_id']))
{
$this->CI->db->where('session_id', $this->userdata['session_id']);
$this->CI->db->delete($this->sess_table_name);
}
// Kill the cookie
setcookie(
$this->sess_cookie_name,
addslashes(serialize(array())),
($this->now - 31500000),
$this->cookie_path,
$this->cookie_domain,
0
);
// Kill session data
$this->userdata = array();
}
// --------------------------------------------------------------------
/**
* Fetch a specific item from the session array
*
* @access public
* @param string
* @return string
*/
function userdata($item)
{
return ( ! isset($this->userdata[$item])) ? FALSE : $this->userdata[$item];
}
// --------------------------------------------------------------------
/**
* Fetch all session data
*
* @access public
* @return array
*/
function all_userdata()
{
return $this->userdata;
}
// --------------------------------------------------------------------
/**
* Add or change data in the "userdata" array
*
* @access public
* @param mixed
* @param string
* @return void
*/
function set_userdata($newdata = array(), $newval = '')
{
if (is_string($newdata))
{
$newdata = array($newdata => $newval);
}
if (count($newdata) > 0)
{
foreach ($newdata as $key => $val)
{
$this->userdata[$key] = $val;
}
}
$this->sess_write();
}
// --------------------------------------------------------------------
/**
* Delete a session variable from the "userdata" array
*
* @access array
* @return void
*/
function unset_userdata($newdata = array())
{
if (is_string($newdata))
{
$newdata = array($newdata => '');
}
if (count($newdata) > 0)
{
foreach ($newdata as $key => $val)
{
unset($this->userdata[$key]);
}
}
$this->sess_write();
}
// ------------------------------------------------------------------------
/**
* Add or change flashdata, only available
* until the next request
*
* @access public
* @param mixed
* @param string
* @return void
*/
function set_flashdata($newdata = array(), $newval = '')
{
if (is_string($newdata))
{
$newdata = array($newdata => $newval);
}
if (count($newdata) > 0)
{
foreach ($newdata as $key => $val)
{
$flashdata_key = $this->flashdata_key.':new:'.$key;
$this->set_userdata($flashdata_key, $val);
}
}
}
// ------------------------------------------------------------------------
/**
* Keeps existing flashdata available to next request.
*
* @access public
* @param string
* @return void
*/
function keep_flashdata($key)
{
// 'old' flashdata gets removed. Here we mark all
// flashdata as 'new' to preserve it from _flashdata_sweep()
// Note the function will return FALSE if the $key
// provided cannot be found
$old_flashdata_key = $this->flashdata_key.':old:'.$key;
$value = $this->userdata($old_flashdata_key);
$new_flashdata_key = $this->flashdata_key.':new:'.$key;
$this->set_userdata($new_flashdata_key, $value);
}
// ------------------------------------------------------------------------
/**
* Fetch a specific flashdata item from the session array
*
* @access public
* @param string
* @return string
*/
function flashdata($key)
{
$flashdata_key = $this->flashdata_key.':old:'.$key;
return $this->userdata($flashdata_key);
}
// ------------------------------------------------------------------------
/**
* Identifies flashdata as 'old' for removal
* when _flashdata_sweep() runs.
*
* @access private
* @return void
*/
function _flashdata_mark()
{
$userdata = $this->all_userdata();
foreach ($userdata as $name => $value)
{
$parts = explode(':new:', $name);
if (is_array($parts) && count($parts) === 2)
{
$new_name = $this->flashdata_key.':old:'.$parts[1];
$this->set_userdata($new_name, $value);
$this->unset_userdata($name);
}
}
}
// ------------------------------------------------------------------------
/**
* Removes all flashdata marked as 'old'
*
* @access private
* @return void
*/
function _flashdata_sweep()
{
$userdata = $this->all_userdata();
foreach ($userdata as $key => $value)
{
if (strpos($key, ':old:'))
{
$this->unset_userdata($key);
}
}
}
// --------------------------------------------------------------------
/**
* Get the "now" time
*
* @access private
* @return string
*/
function _get_time()
{
if (strtolower($this->time_reference) == 'gmt')
{
$now = time();
$time = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now));
}
else
{
$time = time();
}
return $time;
}
// --------------------------------------------------------------------
/**
* Write the session cookie
*
* @access public
* @return void
*/
function _set_cookie($cookie_data = NULL)
{
if (is_null($cookie_data))
{
$cookie_data = $this->userdata;
}
// Serialize the userdata for the cookie
$cookie_data = $this->_serialize($cookie_data);
if ($this->sess_encrypt_cookie == TRUE)
{
$cookie_data = $this->CI->encrypt->encode($cookie_data);
}
else
{
// if encryption is not used, we provide an md5 hash to prevent userside tampering
$cookie_data = $cookie_data.md5($cookie_data.$this->encryption_key);
}
$expire = ($this->sess_expire_on_close === TRUE) ? 0 : $this->sess_expiration + time();
// Set the cookie
setcookie(
$this->sess_cookie_name,
$cookie_data,
$expire,
$this->cookie_path,
$this->cookie_domain,
$this->cookie_secure
);
}
// --------------------------------------------------------------------
/**
* Serialize an array
*
* This function first converts any slashes found in the array to a temporary
* marker, so when it gets unserialized the slashes will be preserved
*
* @access private
* @param array
* @return string
*/
function _serialize($data)
{
if (is_array($data))
{
foreach ($data as $key => $val)
{
if (is_string($val))
{
$data[$key] = str_replace('\\', '{{slash}}', $val);
}
}
}
else
{
if (is_string($data))
{
$data = str_replace('\\', '{{slash}}', $data);
}
}
return serialize($data);
}
// --------------------------------------------------------------------
/**
* Unserialize
*
* This function unserializes a data string, then converts any
* temporary slash markers back to actual slashes
*
* @access private
* @param array
* @return string
*/
function _unserialize($data)
{
$data = @unserialize(strip_slashes($data));
if (is_array($data))
{
foreach ($data as $key => $val)
{
if (is_string($val))
{
$data[$key] = str_replace('{{slash}}', '\\', $val);
}
}
return $data;
}
return (is_string($data)) ? str_replace('{{slash}}', '\\', $data) : $data;
}
// --------------------------------------------------------------------
/**
* Garbage collection
*
* This deletes expired session rows from database
* if the probability percentage is met
*
* @access public
* @return void
*/
function _sess_gc()
{
if ($this->sess_use_database != TRUE)
{
return;
}
srand(time());
if ((rand() % 100) < $this->gc_probability)
{
$expire = $this->now - $this->sess_expiration;
$this->CI->db->where("last_activity < {$expire}");
$this->CI->db->delete($this->sess_table_name);
log_message('debug', 'Session garbage collection performed.');
}
}
}
// END Session Class
/* End of file Session.php */
/* Location: ./system/libraries/Session.php */6、修改config.php中相关的session配置
vim application/config/config.php /* |-------------------------------------------------------------------------- | Session Variables |-------------------------------------------------------------------------- | | 'sess_cookie_name' = the name you want for the cookie | 'sess_expiration' = the number of SECONDS you want the session to last. | by default sessions last 7200 seconds (two hours). Set to zero for no expiration. | 'sess_expire_on_close' = Whether to cause the session to expire automatically | when the browser window is closed | 'sess_encrypt_cookie' = Whether to encrypt the cookie | 'sess_use_database' = Whether to save the session data to a database | 'sess_table_name' = The name of the session database table | 'sess_match_ip' = Whether to match the user's IP address when reading the session data | 'sess_match_useragent' = Whether to match the User Agent when reading the session data | 'sess_update' = 是否开启在规定的时间内更新session信息 | 'sess_time_to_update' = how many seconds between CI refreshing Session Information | */ $config['sess_cookie_name'] = 'icyboy'; $config['sess_expiration'] = 7200; $config['sess_expire_on_close'] = FALSE; $config['sess_encrypt_cookie'] = FALSE; $config['sess_use_database'] = FALSE; $config['sess_table_name'] = 'icyboy'; $config['sess_match_ip'] = FALSE; $config['sess_match_useragent'] = TRUE; $config['sess_update'] = FALSE; $config['sess_time_to_update'] = 300; $config['sess_save_handler'] = 'memcache';7、记得在autoload中加载session