最近使用codeingiter框架，发现默认的session 不是很好用，以下是用法总结：使用的是2.0.2的版本
1.扩展自带的session类：application/libraries/MY_session.php 新增的扩展文件
<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
* Session class using native PHP session.
*
* @package CodeIgniter
* @subpackage Libraries
* @category Sessions
* @author Yvo van Dillen
* @link http://www.atomicon.nl
*/
/*
Example config file: session.php
<?php
//The session name (leave empty for cross application sessions)
$config['sess_name'] = '';
//Time to expire a session AND/OR regenerate the session id
$config['sess_expiration'] = 7200;
//If you want to change the session id every 'sess_expiration' seconds
//turn this to true
$config['sess_regenerate'] = FALSE;
//The flashdata key (this only applies to flashmessages)
$config['sess_flash_key'] = 'flash';
*/
class MY_Session
{
function __construct()
{
log_message('debug', "MY_Session Class Initialized");
get_instance()->load->config('session', FALSE, TRUE);
$this->_sess_run();
}
function data()
{
return $_SESSION;
}
/**
* Regenerates session id
*/
function regenerate_id()
{
// copy old session data, including its id
$old_session_id = session_id();
$old_session_data = isset($_SESSION) ? $_SESSION : array();
// regenerate session id and store it
session_regenerate_id();
$new_session_id = session_id();
// switch to the old session and destroy its storage
if (session_id($old_session_id))
{
session_destroy();
}
// switch back to the new session id and send the cookie
if ($new_session_id)
{
session_id($new_session_id);
session_start();
// restore the old session data into the new session
$_SESSION = $old_session_data;
}
// end the current session and store session data.
session_write_close();
}
/**
* Destroys the session and erases session storage
*/
function destroy()
{
$_SESSION = array();
if ( isset( $_COOKIE[session_name()] ) )
{
setcookie(session_name(), '', time()-, '/');
}
session_destroy();
}
function sess_create()
{
$this->_sess_run();
}
function sess_destroy()
{
$this->destroy();
}
/**
* Reads given session attribute value
*/
function userdata($item)
{
if($item == 'session_id'){ //added for backward-compatibility
return session_id();
}else{
return ( ! isset($_SESSION[$item])) ? false : $_SESSION[$item];
}
}
public function all_userdata()
{
return (array)$_SESSION;
}
/**
* Sets session attributes to the given values
*/
function set_userdata($newdata = array(), $newval = '')
{
if (is_string($newdata))
{
$newdata = array($newdata => $newval);
}
if (count($newdata) > )
{
foreach ($newdata as $key => $val)
{
$_SESSION[$key] = $val;
}
}
}
/**
* Erases given session attributes
*/
function unset_userdata($newdata = array())
{
if (is_string($newdata))
{
$newdata = array($newdata => '');
}
if (count($newdata) > )
{
foreach ($newdata as $key => $val)
{
unset($_SESSION[$key]);
}
}
}
/**
* Starts up the session system for current request
*/
function _sess_run()
{
if (config_item('sess_name'))
{
session_name(config_item('sess_name'));
}
if (session_id()=='')
{
session_start();
}
// check if session id needs regeneration
if ( $this->_session_id_expired() )
{
// regenerate session id (session data stays the
// same, but old session storage is destroyed)
if (config_item('sess_regenerate'))
{
$this->regenerate_id();
return;
}
}
// 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();
}
/**
* Checks if session has expired
*/
function _session_id_expired()
{
$sess_expiration = config_item('sess_expiration');
if (is_numeric($sess_expiration) && $sess_expiration > )
{
if (config_item('sess_regenerate'))
{
if ( !isset($_SESSION['_sess:last-generated']) )
{
$_SESSION['_sess:last-generated'] = time();
return false;
}
else
{
$expiry_time = $_SESSION['_sess:last-generated'] + $sess_expiration;
if (time() >= $expiry_time)
{
return true;
}
}
}
else
{
if (isset($_SESSION['_sess:last-activation']))
{
$expiry_time = $_SESSION['_sess:last-activation'] + $sess_expiration;
if (time() >= $expiry_time)
{
$this->destroy();
return true;
}
}
$_SESSION['_sess:last-activation'] = time();
}
}
return false;
}
/**
* Sets "flash" data which will be available only in next request (then it will
* be deleted from session). You can use it to implement "Save succeeded" messages
* after redirect.
*/
function set_flashdata($key, $value)
{
$flash_key = config_item('sess_flash_key').':new:'.$key;
$this->set_userdata($flash_key, $value);
}
/**
* Keeps existing "flash" data available to next request.
*/
function keep_flashdata($key)
{
$old_flash_key = config_item('sess_flash_key').':old:'.$key;
$value = $this->userdata($old_flash_key);
$new_flash_key = config_item('sess_flash_key').':new:'.$key;
$this->set_userdata($new_flash_key, $value);
}
/**
* Returns "flash" data for the given key.
*/
function flashdata($key)
{
$flash_key = config_item('sess_flash_key').':old:'.$key;
return $this->userdata($flash_key);
}
/**
* PRIVATE: Internal method - marks "flash" session attributes as 'old'
*/
function _flashdata_mark()
{
foreach ($_SESSION as $name => $value)
{
$parts = explode(':new:', $name);
if (is_array($parts) && count($parts) == )
{
$new_name = config_item('sess_flash_key').':old:'.$parts[];
$this->set_userdata($new_name, $value);
$this->unset_userdata($name);
}
}
}
/**
* PRIVATE: Internal method - removes "flash" session marked as 'old'
*/
function _flashdata_sweep()
{
foreach ($_SESSION as $name => $value)
{
$parts = explode(':old:', $name);
if (is_array($parts) && count($parts) == && $parts[] == config_item('sess_flash_key'))
{
$this->unset_userdata($name);
}
}
}
}
2.在控制器中使用方法：
设置session:注意 如果把 数组赋给一个变量，则不起效果
$this->session->set_userdata(array(
'authorization' => array(
'id' => ,
'code' => '',
)
));
3.获取session:
print_r( $this->session->userdata('authorization') ) ;