koseven/system/classes/KO7/Session/Cookie.php

<?php
/**
 * Cookie-based session class.
 *
 * @package    KO7
 * @category   Session
 *
 * @copyright  (c) 2007-2016  Kohana Team
 * @copyright  (c) since 2016 Koseven Team
 * @license    https://koseven.dev/LICENSE
 */
class KO7_Session_Cookie extends Session {

	/**
	 * @param   string  $id  session id
	 * @return  string
	 */
	protected function _read($id = NULL)
	{
		return Cookie::get($this->_name, NULL);
	}

	/**
	 * @return  null
	 */
	protected function _regenerate()
	{
		// Cookie sessions have no id
		return NULL;
	}

	/**
	 * @return  bool
	 */
	protected function _write()
	{
		return Cookie::set($this->_name, $this->__toString(), $this->_lifetime);
	}

	/**
	 * @return  bool
	 */
	protected function _restart()
	{
		return TRUE;
	}

	/**
	 * @return  bool
	 */
	protected function _destroy()
	{
		return Cookie::delete($this->_name);
	}

}