重定向后在codeigniter中销毁会话答案

【问题标题】：session destroying in codeigniter after redirecting重定向后在codeigniter中销毁会话
【发布时间】：2014-08-23 08:01:58
【问题描述】：

在我的登录控制器中，我已将所有用户数据存储在会话中。我也通过打印验证了

all_userdata();

当重定向到另一个控制器 home 时，会话被破坏。请帮我解决这个问题。会话数据如下。

)

【问题讨论】：

标签： php codeigniter

【解决方案1】：

这与我在 IE7/IE8 上进行测试时遇到的问题相同。
我在这里找到了一个解决方案：http://www.philsbury.co.uk/blog/code-igniter-sessions

这是一个有人为第三方修复的问题，它修补了会话控制器。看看上面的链接说了什么，

解决方案：

1) 为此，您必须在 application/libraries 目录中创建一个新文件 Session.php。
2) 将以下源代码复制到新建的文件中。

<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');

/**
* Session class using native PHP session features and hardened against session fixation.
*
* @package     CodeIgniter
* @subpackage  Libraries
* @category    Sessions
* @author      Dariusz Debowczyk
* @link        http://www.codeigniter.com/user_guide/libraries/sessions.html
*/
class CI_Session {

    var $flash_key = 'flash'; // prefix for "flash" variables (eg. flash:new:message)

    function CI_Session()
    {
        $this->object =& get_instance();
        log_message('debug', "Native_session Class Initialized");
        $this->_sess_run();
    }

    /**
    * Regenerates session id
    */
    function regenerate_id()
    {
        // copy old session data, including its id
        $old_session_id = session_id();
        $old_session_data = $_SESSION;

        // regenerate session id and store it
        session_regenerate_id();
        $new_session_id = session_id();

        // switch to the old session and destroy its storage
        session_id($old_session_id);
        session_destroy();

        // switch back to the new session id and send the cookie
        session_id($new_session_id);
        session_start();

        // restore the old session data into the new session
        $_SESSION = $old_session_data;

        // update the session creation time
        $_SESSION['regenerated'] = time();

        // session_write_close() patch based on this thread
        // http://www.codeigniter.com/forums/viewthread/1624/
        // there is a question mark ?? as to side affects

        // end the current session and store session data.
        session_write_close();
    }

    /**
    * Destroys the session and erases session storage
    */
    function destroy()
    {
        unset($_SESSION);
        if ( isset( $_COOKIE[session_name()] ) )
        {
            setcookie(session_name(), '', time()-42000, '/');
        }
        session_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];
        }
    }

    /**
    * Sets session attributes to the given values
    */
    function set_userdata($newdata = array(), $newval = '')
    {
        if (is_string($newdata))
        {
            $newdata = array($newdata => $newval);
        }

        if (count($newdata) > 0)
        {
            foreach ($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($newdata) > 0)
        {
            foreach ($newdata as $key => $val)
            {
                unset($_SESSION[$key]);
            }
        }
    }

    /**
    * Starts up the session system for current request
    */
    function _sess_run()
    {
        session_start();

        $session_id_ttl = $this->object->config->item('sess_expiration');

        if (is_numeric($session_id_ttl))
        {
            if ($session_id_ttl > 0)
            {
                $this->session_id_ttl = $this->object->config->item('sess_expiration');
            }
            else
            {
                $this->session_id_ttl = (60*60*24*365*2);
            }
        }

        // 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)
            $this->regenerate_id();
        }

        // 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()
    {
        if ( !isset( $_SESSION['regenerated'] ) )
        {
            $_SESSION['regenerated'] = time();
            return false;
        }

        $expiry_time = time() - $this->session_id_ttl;

        if ( $_SESSION['regenerated'] <=  $expiry_time )
        {
            return true;
        }

        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 = $this->flash_key.':new:'.$key;
        $this->set_userdata($flash_key, $value);
    }

    /**
    * Keeps existing "flash" data available to next request.
    */
    function keep_flashdata($key)
    {
        $old_flash_key = $this->flash_key.':old:'.$key;
        $value = $this->userdata($old_flash_key);

        $new_flash_key = $this->flash_key.':new:'.$key;
        $this->set_userdata($new_flash_key, $value);
    }

    /**
    * Returns "flash" data for the given key.
    */
    function flashdata($key)
    {
        $flash_key = $this->flash_key.':old:'.$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) == 2)
            {
                $new_name = $this->flash_key.':old:'.$parts[1];
                $this->set_userdata($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) == 2 && $parts[0] == $this->flash_key)
            {
                $this->unset_userdata($name);
            }
        }
    }
}
?>

3) 然后加载库，

$this->load->library('session');

【讨论】：

【解决方案2】：

我在 config.php 中更新了以下值来解决问题：

$config['cookie_domain'] = 'mydomain.com';   // enter your domain name

$config['cookie_secure'] = FALSE; // set "TRUE" only for https sites

【讨论】：

【解决方案3】：

我通过在配置文件中设置这个参数解决了这个问题：

$config['cookie_domain']= '';

【讨论】：

【解决方案4】：

这是您拥有的 Codeigniter 版本。最好的方法是编辑会话写入和读取。打开这个文件

系统/库/Session/session.php

去281号线

ini_set('session.name', $params['cookie_name']);

将 session.name 替换为 session.id

ini_set('session.id', $params['cookie_name']);

【讨论】：

这在 CodeIgniter 版本 3.0.6 中对我有用。谢谢@gangi

【解决方案5】：

最好使用 $config['sess_driver'] = 'database' 将会话存储在数据库中。

首先是配置，

$config['sess_table_name'] = 'your_sessions_table';
$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'yoursite_sessions';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

然后是 cookie，

$config['cookie_prefix']    = 'yourcookie';
$config['cookie_domain']    = 'cookie.domain'; //use your domain name.  For multisite configuration use '.yourdomain.com'
$config['cookie_path']      = '/';
$config['cookie_secure']    = FALSE;
$config['cookie_httponly']  = FALSE;

最后，创建一个会话表，

CREATE TABLE `your_sessions_table` (
  `id` varchar(40) NOT NULL,
  `ip_address` varchar(45) NOT NULL,
  `timestamp` bigint(20) NOT NULL DEFAULT '0',
  `data` text NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

这样，在你打电话之前，你永远不会丢失会话

$this->session->sess_destroy();

【讨论】：

【解决方案6】：

我设置了这两个选项，然后只有它在 Codeigniter 3.1.0 中工作

$config['cookie_domain'] = 'mydomain.com';   // enter your domain name

$config['cookie_secure'] = FALSE; // set "TRUE" only for https sites

最好的方法是编辑会话写作和阅读

system/libraries/Session/session.php

去281号线

ini_set('session.name', $params['cookie_name']);

将 session.name 替换为 session.id

ini_set('session.id', $params['cookie_name']);

【讨论】：