Codeigniter Session Destroy setelah Redirect

Beberapa hari yang lalu saya pernah mengalami permasalahan ketika update xampp dari versi 1.7.7 menjadi 1.8.3. saya tidak tau sebenarnya penyebabnya apakah di versi PHP nya atau Bug dari CI sendiri.

Setelah saya browsing kesana kemari, ketemulah solusinya, yaitu dengan membuat library session tersendiri dan alhamdulillah worked!!!

Langkah Pertama :
Buatlah file dengan nama Session PHP dan letakkan pada folder application/libraries.

Langkah Kedua :
Kemudian isi file tersebut dengan code dibawah ini :

<?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);
   }
  }
 }
}
?>

Cara ini berhasil untuk permasalahan saya.

Terima kasih untuk Yakub, blognya bermanfaat,

Sumber : http://www.philsbury.co.uk/blog/code-igniter-sessions

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Codeigniter Session Destroy setelah Redirect

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