Merge CodeIgniter 3 support

1 files changed, 985 insertions, 0 deletions

diff --git a/system/libraries/Session/Session.php b/system/libraries/Session/Session.php
new file mode 100644
index 000000000..eb433de64
--- /dev/null
+++ b/system/libraries/Session/Session.php
@@ -0,0 +1,985 @@
+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP
+ *
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2017, British Columbia Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @package	CodeIgniter
+ * @author	EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
+ * @copyright	Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
+ * @license	http://opensource.org/licenses/MIT	MIT License
+ * @link	https://codeigniter.com
+ * @since	Version 2.0.0
+ * @filesource
+ */
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/**
+ * CodeIgniter Session Class
+ *
+ * @package		CodeIgniter
+ * @subpackage	Libraries
+ * @category	Sessions
+ * @author		Andrey Andreev
+ * @link		https://codeigniter.com/user_guide/libraries/sessions.html
+ */
+class CI_Session {
+
+	/**
+	 * Userdata array
+	 *
+	 * Just a reference to $_SESSION, for BC purposes.
+	 */
+	public $userdata;
+
+	protected $_driver = 'files';
+	protected $_config;
+	protected $_sid_regexp;
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Class constructor
+	 *
+	 * @param	array	$params	Configuration parameters
+	 * @return	void
+	 */
+	public function __construct(array $params = array())
+	{
+		// No sessions under CLI
+		if (is_cli())
+		{
+			log_message('debug', 'Session: Initialization under CLI aborted.');
+			return;
+		}
+		elseif ((bool) ini_get('session.auto_start'))
+		{
+			log_message('error', 'Session: session.auto_start is enabled in php.ini. Aborting.');
+			return;
+		}
+		elseif ( ! empty($params['driver']))
+		{
+			$this->_driver = $params['driver'];
+			unset($params['driver']);
+		}
+		elseif ($driver = config_item('sess_driver'))
+		{
+			$this->_driver = $driver;
+		}
+		// Note: BC workaround
+		elseif (config_item('sess_use_database'))
+		{
+			log_message('debug', 'Session: "sess_driver" is empty; using BC fallback to "sess_use_database".');
+			$this->_driver = 'database';
+		}
+
+		$class = $this->_ci_load_classes($this->_driver);
+
+		// Configuration ...
+		$this->_configure($params);
+		$this->_config['_sid_regexp'] = $this->_sid_regexp;
+
+		$class = new $class($this->_config);
+		if ($class instanceof SessionHandlerInterface)
+		{
+			if (is_php('5.4'))
+			{
+				session_set_save_handler($class, TRUE);
+			}
+			else
+			{
+				session_set_save_handler(
+					array($class, 'open'),
+					array($class, 'close'),
+					array($class, 'read'),
+					array($class, 'write'),
+					array($class, 'destroy'),
+					array($class, 'gc')
+				);
+
+				register_shutdown_function('session_write_close');
+			}
+		}
+		else
+		{
+			log_message('error', "Session: Driver '".$this->_driver."' doesn't implement SessionHandlerInterface. Aborting.");
+			return;
+		}
+
+		// Sanitize the cookie, because apparently PHP doesn't do that for userspace handlers
+		if (isset($_COOKIE[$this->_config['cookie_name']])
+			&& (
+				! is_string($_COOKIE[$this->_config['cookie_name']])
+				OR ! preg_match('#\A'.$this->_sid_regexp.'\z#', $_COOKIE[$this->_config['cookie_name']])
+			)
+		)
+		{
+			unset($_COOKIE[$this->_config['cookie_name']]);
+		}
+
+		session_start();
+
+		// Is session ID auto-regeneration configured? (ignoring ajax requests)
+		if ((empty($_SERVER['HTTP_X_REQUESTED_WITH']) OR strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) !== 'xmlhttprequest')
+			&& ($regenerate_time = config_item('sess_time_to_update')) > 0
+		)
+		{
+			if ( ! isset($_SESSION['__ci_last_regenerate']))
+			{
+				$_SESSION['__ci_last_regenerate'] = time();
+			}
+			elseif ($_SESSION['__ci_last_regenerate'] < (time() - $regenerate_time))
+			{
+				$this->sess_regenerate((bool) config_item('sess_regenerate_destroy'));
+			}
+		}
+		// Another work-around ... PHP doesn't seem to send the session cookie
+		// unless it is being currently created or regenerated
+		elseif (isset($_COOKIE[$this->_config['cookie_name']]) && $_COOKIE[$this->_config['cookie_name']] === session_id())
+		{
+			setcookie(
+				$this->_config['cookie_name'],
+				session_id(),
+				(empty($this->_config['cookie_lifetime']) ? 0 : time() + $this->_config['cookie_lifetime']),
+				$this->_config['cookie_path'],
+				$this->_config['cookie_domain'],
+				$this->_config['cookie_secure'],
+				TRUE
+			);
+		}
+
+		$this->_ci_init_vars();
+
+		log_message('info', "Session: Class initialized using '".$this->_driver."' driver.");
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * CI Load Classes
+	 *
+	 * An internal method to load all possible dependency and extension
+	 * classes. It kind of emulates the CI_Driver library, but is
+	 * self-sufficient.
+	 *
+	 * @param	string	$driver	Driver name
+	 * @return	string	Driver class name
+	 */
+	protected function _ci_load_classes($driver)
+	{
+		// PHP 5.4 compatibility
+		interface_exists('SessionHandlerInterface', FALSE) OR require_once(BASEPATH.'libraries/Session/SessionHandlerInterface.php');
+
+		$prefix = config_item('subclass_prefix');
+
+		if ( ! class_exists('CI_Session_driver', FALSE))
+		{
+			require_once(
+				file_exists(APPPATH.'libraries/Session/Session_driver.php')
+					? APPPATH.'libraries/Session/Session_driver.php'
+					: BASEPATH.'libraries/Session/Session_driver.php'
+			);
+
+			if (file_exists($file_path = APPPATH.'libraries/Session/'.$prefix.'Session_driver.php'))
+			{
+				require_once($file_path);
+			}
+		}
+
+		$class = 'Session_'.$driver.'_driver';
+
+		// Allow custom drivers without the CI_ or MY_ prefix
+		if ( ! class_exists($class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$class.'.php'))
+		{
+			require_once($file_path);
+			if (class_exists($class, FALSE))
+			{
+				return $class;
+			}
+		}
+
+		if ( ! class_exists('CI_'.$class, FALSE))
+		{
+			if (file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$class.'.php') OR file_exists($file_path = BASEPATH.'libraries/Session/drivers/'.$class.'.php'))
+			{
+				require_once($file_path);
+			}
+
+			if ( ! class_exists('CI_'.$class, FALSE) && ! class_exists($class, FALSE))
+			{
+				throw new UnexpectedValueException("Session: Configured driver '".$driver."' was not found. Aborting.");
+			}
+		}
+
+		if ( ! class_exists($prefix.$class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$prefix.$class.'.php'))
+		{
+			require_once($file_path);
+			if (class_exists($prefix.$class, FALSE))
+			{
+				return $prefix.$class;
+			}
+			else
+			{
+				log_message('debug', 'Session: '.$prefix.$class.".php found but it doesn't declare class ".$prefix.$class.'.');
+			}
+		}
+
+		return 'CI_'.$class;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Configuration
+	 *
+	 * Handle input parameters and configuration defaults
+	 *
+	 * @param	array	&$params	Input parameters
+	 * @return	void
+	 */
+	protected function _configure(&$params)
+	{
+		$expiration = config_item('sess_expiration');
+
+		if (isset($params['cookie_lifetime']))
+		{
+			$params['cookie_lifetime'] = (int) $params['cookie_lifetime'];
+		}
+		else
+		{
+			$params['cookie_lifetime'] = ( ! isset($expiration) && config_item('sess_expire_on_close'))
+				? 0 : (int) $expiration;
+		}
+
+		isset($params['cookie_name']) OR $params['cookie_name'] = config_item('sess_cookie_name');
+		if (empty($params['cookie_name']))
+		{
+			$params['cookie_name'] = ini_get('session.name');
+		}
+		else
+		{
+			ini_set('session.name', $params['cookie_name']);
+		}
+
+		isset($params['cookie_path']) OR $params['cookie_path'] = config_item('cookie_path');
+		isset($params['cookie_domain']) OR $params['cookie_domain'] = config_item('cookie_domain');
+		isset($params['cookie_secure']) OR $params['cookie_secure'] = (bool) config_item('cookie_secure');
+
+		session_set_cookie_params(
+			$params['cookie_lifetime'],
+			$params['cookie_path'],
+			$params['cookie_domain'],
+			$params['cookie_secure'],
+			TRUE // HttpOnly; Yes, this is intentional and not configurable for security reasons
+		);
+
+		if (empty($expiration))
+		{
+			$params['expiration'] = (int) ini_get('session.gc_maxlifetime');
+		}
+		else
+		{
+			$params['expiration'] = (int) $expiration;
+			ini_set('session.gc_maxlifetime', $expiration);
+		}
+
+		$params['match_ip'] = (bool) (isset($params['match_ip']) ? $params['match_ip'] : config_item('sess_match_ip'));
+
+		isset($params['save_path']) OR $params['save_path'] = config_item('sess_save_path');
+
+		$this->_config = $params;
+
+		// Security is king
+		ini_set('session.use_trans_sid', 0);
+		ini_set('session.use_strict_mode', 1);
+		ini_set('session.use_cookies', 1);
+		ini_set('session.use_only_cookies', 1);
+
+		$this->_configure_sid_length();
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Configure session ID length
+	 *
+	 * To make life easier, we used to force SHA-1 and 4 bits per
+	 * character on everyone. And of course, someone was unhappy.
+	 *
+	 * Then PHP 7.1 broke backwards-compatibility because ext/session
+	 * is such a mess that nobody wants to touch it with a pole stick,
+	 * and the one guy who does, nobody has the energy to argue with.
+	 *
+	 * So we were forced to make changes, and OF COURSE something was
+	 * going to break and now we have this pile of shit. -- Narf
+	 *
+	 * @return	void
+	 */
+	protected function _configure_sid_length()
+	{
+		if (PHP_VERSION_ID < 70100)
+		{
+			$hash_function = ini_get('session.hash_function');
+			if (ctype_digit($hash_function))
+			{
+				if ($hash_function !== '1')
+				{
+					ini_set('session.hash_function', 1);
+				}
+
+				$bits = 160;
+			}
+			elseif ( ! in_array($hash_function, hash_algos(), TRUE))
+			{
+				ini_set('session.hash_function', 1);
+				$bits = 160;
+			}
+			elseif (($bits = strlen(hash($hash_function, 'dummy', false)) * 4) < 160)
+			{
+				ini_set('session.hash_function', 1);
+				$bits = 160;
+			}
+
+			$bits_per_character = (int) ini_get('session.hash_bits_per_character');
+			$sid_length         = (int) ceil($bits / $bits_per_character);
+		}
+		else
+		{
+			$bits_per_character = (int) ini_get('session.sid_bits_per_character');
+			$sid_length         = (int) ini_get('session.sid_length');
+			if (($bits = $sid_length * $bits_per_character) < 160)
+			{
+				// Add as many more characters as necessary to reach at least 160 bits
+				$sid_length += (int) ceil((160 % $bits) / $bits_per_character);
+				ini_set('session.sid_length', $sid_length);
+			}
+		}
+
+		// Yes, 4,5,6 are the only known possible values as of 2016-10-27
+		switch ($bits_per_character)
+		{
+			case 4:
+				$this->_sid_regexp = '[0-9a-f]';
+				break;
+			case 5:
+				$this->_sid_regexp = '[0-9a-v]';
+				break;
+			case 6:
+				$this->_sid_regexp = '[0-9a-zA-Z,-]';
+				break;
+		}
+
+		$this->_sid_regexp .= '{'.$sid_length.'}';
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Handle temporary variables
+	 *
+	 * Clears old "flash" data, marks the new one for deletion and handles
+	 * "temp" data deletion.
+	 *
+	 * @return	void
+	 */
+	protected function _ci_init_vars()
+	{
+		if ( ! empty($_SESSION['__ci_vars']))
+		{
+			$current_time = time();
+
+			foreach ($_SESSION['__ci_vars'] as $key => &$value)
+			{
+				if ($value === 'new')
+				{
+					$_SESSION['__ci_vars'][$key] = 'old';
+				}
+				// Hacky, but 'old' will (implicitly) always be less than time() ;)
+				// DO NOT move this above the 'new' check!
+				elseif ($value < $current_time)
+				{
+					unset($_SESSION[$key], $_SESSION['__ci_vars'][$key]);
+				}
+			}
+
+			if (empty($_SESSION['__ci_vars']))
+			{
+				unset($_SESSION['__ci_vars']);
+			}
+		}
+
+		$this->userdata =& $_SESSION;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Mark as flash
+	 *
+	 * @param	mixed	$key	Session data key(s)
+	 * @return	bool
+	 */
+	public function mark_as_flash($key)
+	{
+		if (is_array($key))
+		{
+			for ($i = 0, $c = count($key); $i < $c; $i++)
+			{
+				if ( ! isset($_SESSION[$key[$i]]))
+				{
+					return FALSE;
+				}
+			}
+
+			$new = array_fill_keys($key, 'new');
+
+			$_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars'])
+				? array_merge($_SESSION['__ci_vars'], $new)
+				: $new;
+
+			return TRUE;
+		}
+
+		if ( ! isset($_SESSION[$key]))
+		{
+			return FALSE;
+		}
+
+		$_SESSION['__ci_vars'][$key] = 'new';
+		return TRUE;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Get flash keys
+	 *
+	 * @return	array
+	 */
+	public function get_flash_keys()
+	{
+		if ( ! isset($_SESSION['__ci_vars']))
+		{
+			return array();
+		}
+
+		$keys = array();
+		foreach (array_keys($_SESSION['__ci_vars']) as $key)
+		{
+			is_int($_SESSION['__ci_vars'][$key]) OR $keys[] = $key;
+		}
+
+		return $keys;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Unmark flash
+	 *
+	 * @param	mixed	$key	Session data key(s)
+	 * @return	void
+	 */
+	public function unmark_flash($key)
+	{
+		if (empty($_SESSION['__ci_vars']))
+		{
+			return;
+		}
+
+		is_array($key) OR $key = array($key);
+
+		foreach ($key as $k)
+		{
+			if (isset($_SESSION['__ci_vars'][$k]) && ! is_int($_SESSION['__ci_vars'][$k]))
+			{
+				unset($_SESSION['__ci_vars'][$k]);
+			}
+		}
+
+		if (empty($_SESSION['__ci_vars']))
+		{
+			unset($_SESSION['__ci_vars']);
+		}
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Mark as temp
+	 *
+	 * @param	mixed	$key	Session data key(s)
+	 * @param	int	$ttl	Time-to-live in seconds
+	 * @return	bool
+	 */
+	public function mark_as_temp($key, $ttl = 300)
+	{
+		$ttl += time();
+
+		if (is_array($key))
+		{
+			$temp = array();
+
+			foreach ($key as $k => $v)
+			{
+				// Do we have a key => ttl pair, or just a key?
+				if (is_int($k))
+				{
+					$k = $v;
+					$v = $ttl;
+				}
+				else
+				{
+					$v += time();
+				}
+
+				if ( ! isset($_SESSION[$k]))
+				{
+					return FALSE;
+				}
+
+				$temp[$k] = $v;
+			}
+
+			$_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars'])
+				? array_merge($_SESSION['__ci_vars'], $temp)
+				: $temp;
+
+			return TRUE;
+		}
+
+		if ( ! isset($_SESSION[$key]))
+		{
+			return FALSE;
+		}
+
+		$_SESSION['__ci_vars'][$key] = $ttl;
+		return TRUE;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Get temp keys
+	 *
+	 * @return	array
+	 */
+	public function get_temp_keys()
+	{
+		if ( ! isset($_SESSION['__ci_vars']))
+		{
+			return array();
+		}
+
+		$keys = array();
+		foreach (array_keys($_SESSION['__ci_vars']) as $key)
+		{
+			is_int($_SESSION['__ci_vars'][$key]) && $keys[] = $key;
+		}
+
+		return $keys;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Unmark flash
+	 *
+	 * @param	mixed	$key	Session data key(s)
+	 * @return	void
+	 */
+	public function unmark_temp($key)
+	{
+		if (empty($_SESSION['__ci_vars']))
+		{
+			return;
+		}
+
+		is_array($key) OR $key = array($key);
+
+		foreach ($key as $k)
+		{
+			if (isset($_SESSION['__ci_vars'][$k]) && is_int($_SESSION['__ci_vars'][$k]))
+			{
+				unset($_SESSION['__ci_vars'][$k]);
+			}
+		}
+
+		if (empty($_SESSION['__ci_vars']))
+		{
+			unset($_SESSION['__ci_vars']);
+		}
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * __get()
+	 *
+	 * @param	string	$key	'session_id' or a session data key
+	 * @return	mixed
+	 */
+	public function __get($key)
+	{
+		// Note: Keep this order the same, just in case somebody wants to
+		//       use 'session_id' as a session data key, for whatever reason
+		if (isset($_SESSION[$key]))
+		{
+			return $_SESSION[$key];
+		}
+		elseif ($key === 'session_id')
+		{
+			return session_id();
+		}
+
+		return NULL;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * __isset()
+	 *
+	 * @param	string	$key	'session_id' or a session data key
+	 * @return	bool
+	 */
+	public function __isset($key)
+	{
+		if ($key === 'session_id')
+		{
+			return (session_status() === PHP_SESSION_ACTIVE);
+		}
+
+		return isset($_SESSION[$key]);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * __set()
+	 *
+	 * @param	string	$key	Session data key
+	 * @param	mixed	$value	Session data value
+	 * @return	void
+	 */
+	public function __set($key, $value)
+	{
+		$_SESSION[$key] = $value;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Session destroy
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @return	void
+	 */
+	public function sess_destroy()
+	{
+		session_destroy();
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Session regenerate
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	bool	$destroy	Destroy old session data flag
+	 * @return	void
+	 */
+	public function sess_regenerate($destroy = FALSE)
+	{
+		$_SESSION['__ci_last_regenerate'] = time();
+		session_regenerate_id($destroy);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Get userdata reference
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @returns	array
+	 */
+	public function &get_userdata()
+	{
+		return $_SESSION;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Userdata (fetch)
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	string	$key	Session data key
+	 * @return	mixed	Session data value or NULL if not found
+	 */
+	public function userdata($key = NULL)
+	{
+		if (isset($key))
+		{
+			return isset($_SESSION[$key]) ? $_SESSION[$key] : NULL;
+		}
+		elseif (empty($_SESSION))
+		{
+			return array();
+		}
+
+		$userdata = array();
+		$_exclude = array_merge(
+			array('__ci_vars'),
+			$this->get_flash_keys(),
+			$this->get_temp_keys()
+		);
+
+		foreach (array_keys($_SESSION) as $key)
+		{
+			if ( ! in_array($key, $_exclude, TRUE))
+			{
+				$userdata[$key] = $_SESSION[$key];
+			}
+		}
+
+		return $userdata;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Set userdata
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	mixed	$data	Session data key or an associative array
+	 * @param	mixed	$value	Value to store
+	 * @return	void
+	 */
+	public function set_userdata($data, $value = NULL)
+	{
+		if (is_array($data))
+		{
+			foreach ($data as $key => &$value)
+			{
+				$_SESSION[$key] = $value;
+			}
+
+			return;
+		}
+
+		$_SESSION[$data] = $value;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Unset userdata
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	mixed	$key	Session data key(s)
+	 * @return	void
+	 */
+	public function unset_userdata($key)
+	{
+		if (is_array($key))
+		{
+			foreach ($key as $k)
+			{
+				unset($_SESSION[$k]);
+			}
+
+			return;
+		}
+
+		unset($_SESSION[$key]);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * All userdata (fetch)
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @return	array	$_SESSION, excluding flash data items
+	 */
+	public function all_userdata()
+	{
+		return $this->userdata();
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Has userdata
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	string	$key	Session data key
+	 * @return	bool
+	 */
+	public function has_userdata($key)
+	{
+		return isset($_SESSION[$key]);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Flashdata (fetch)
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	string	$key	Session data key
+	 * @return	mixed	Session data value or NULL if not found
+	 */
+	public function flashdata($key = NULL)
+	{
+		if (isset($key))
+		{
+			return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) && ! is_int($_SESSION['__ci_vars'][$key]))
+				? $_SESSION[$key]
+				: NULL;
+		}
+
+		$flashdata = array();
+
+		if ( ! empty($_SESSION['__ci_vars']))
+		{
+			foreach ($_SESSION['__ci_vars'] as $key => &$value)
+			{
+				is_int($value) OR $flashdata[$key] = $_SESSION[$key];
+			}
+		}
+
+		return $flashdata;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Set flashdata
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	mixed	$data	Session data key or an associative array
+	 * @param	mixed	$value	Value to store
+	 * @return	void
+	 */
+	public function set_flashdata($data, $value = NULL)
+	{
+		$this->set_userdata($data, $value);
+		$this->mark_as_flash(is_array($data) ? array_keys($data) : $data);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Keep flashdata
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	mixed	$key	Session data key(s)
+	 * @return	void
+	 */
+	public function keep_flashdata($key)
+	{
+		$this->mark_as_flash($key);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Temp data (fetch)
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	string	$key	Session data key
+	 * @return	mixed	Session data value or NULL if not found
+	 */
+	public function tempdata($key = NULL)
+	{
+		if (isset($key))
+		{
+			return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) && is_int($_SESSION['__ci_vars'][$key]))
+				? $_SESSION[$key]
+				: NULL;
+		}
+
+		$tempdata = array();
+
+		if ( ! empty($_SESSION['__ci_vars']))
+		{
+			foreach ($_SESSION['__ci_vars'] as $key => &$value)
+			{
+				is_int($value) && $tempdata[$key] = $_SESSION[$key];
+			}
+		}
+
+		return $tempdata;
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Set tempdata
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	mixed	$data	Session data key or an associative array of items
+	 * @param	mixed	$value	Value to store
+	 * @param	int	$ttl	Time-to-live in seconds
+	 * @return	void
+	 */
+	public function set_tempdata($data, $value = NULL, $ttl = 300)
+	{
+		$this->set_userdata($data, $value);
+		$this->mark_as_temp(is_array($data) ? array_keys($data) : $data, $ttl);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	 * Unset tempdata
+	 *
+	 * Legacy CI_Session compatibility method
+	 *
+	 * @param	mixed	$data	Session data key(s)
+	 * @return	void
+	 */
+	public function unset_tempdata($key)
+	{
+		$this->unmark_temp($key);
+	}
+
+}