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google_forms/system/libraries/Session/Session.php

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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2019 - 2022, CodeIgniter Foundation
*
* 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
* @copyright Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
* @license https://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/userguide3/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);
$wrapper = new CI_SessionWrapper($class);
if (is_php('5.4'))
{
session_set_save_handler($wrapper, TRUE);
}
else
{
session_set_save_handler(
array($wrapper, 'open'),
array($wrapper, 'close'),
array($wrapper, 'read'),
array($wrapper, 'write'),
array($wrapper, 'destroy'),
array($wrapper, 'gc')
);
register_shutdown_function('session_write_close');
}
// Sanitize the cookie, because apparently PHP doesn't do that for userspace handlers
if (isset($_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())
{
$expires = empty($this->_config['cookie_lifetime']) ? 0 : time() + $this->_config['cookie_lifetime'];
if (is_php('7.3'))
{
setcookie(
$this->_config['cookie_name'],
session_id(),
array(
'expires' => $expires,
'path' => $this->_config['cookie_path'],
'domain' => $this->_config['cookie_domain'],
'secure' => $this->_config['cookie_secure'],
'httponly' => TRUE,
'samesite' => $this->_config['cookie_samesite']
)
);
}
else
{
$header = 'Set-Cookie: '.$this->_config['cookie_name'].'='.session_id();
$header .= empty($expires) ? '' : '; Expires='.gmdate('D, d-M-Y H:i:s T', $expires).'; Max-Age='.$this->_config['cookie_lifetime'];
$header .= '; Path='.$this->_config['cookie_path'];
$header .= ($this->_config['cookie_domain'] !== '' ? '; Domain='.$this->_config['cookie_domain'] : '');
$header .= ($this->_config['cookie_secure'] ? '; Secure' : '').'; HttpOnly; SameSite='.$this->_config['cookie_samesite'];
header($header);
}
if ( ! $this->_config['cookie_secure'] && $this->_config['cookie_samesite'] === 'None')
{
log_message('error', "Session: '".$this->_config['cookie_name']."' cookie sent with SameSite=None, but without Secure attribute.'");
}
}
$this->_ci_init_vars();
log_message('info', "Session: Class initialized using '".$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');
// PHP 7 compatibility
interface_exists('SessionUpdateTimestampHandlerInterface', FALSE) OR require_once(BASEPATH.'libraries/Session/SessionUpdateTimestampHandlerInterface.php');
require_once(BASEPATH.'libraries/Session/CI_Session_driver_interface.php');
$wrapper = is_php('8.0') ? 'PHP8SessionWrapper' : 'OldSessionWrapper';
require_once(BASEPATH.'libraries/Session/'.$wrapper.'.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;
}
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 $params['cookie_secure'] = (bool) config_item('cookie_secure');
isset($params['cookie_samesite']) OR $params['cookie_samesite'] = config_item('sess_samesite');
if ( ! isset($params['cookie_samesite']) && is_php('7.3'))
{
$params['cookie_samesite'] = ini_get('session.cookie_samesite');
}
if (isset($params['cookie_samesite']))
{
$params['cookie_samesite'] = ucfirst(strtolower($params['cookie_samesite']));
in_array($params['cookie_samesite'], array('Lax', 'Strict', 'None'), TRUE) OR $params['cookie_samesite'] = 'Lax';
}
else
{
$params['cookie_samesite'] = 'Lax';
}
if (is_php('7.3'))
{
session_set_cookie_params(array(
'lifetime' => $params['cookie_lifetime'],
'path' => $params['cookie_path'],
'domain' => $params['cookie_domain'],
'secure' => $params['cookie_secure'],
'httponly' => TRUE,
'samesite' => $params['cookie_samesite']
));
}
else
{
session_set_cookie_params(
$params['cookie_lifetime'],
$params['cookie_path'].'; SameSite='.$params['cookie_samesite'],
$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';
}
elseif ($value === 'old' || $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 temp
*
* @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
*
* @return 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);
}
}
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