system/library/session/db.php

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<?php
/*
CREATE TABLE IF NOT EXISTS `session` (
  `session_id` varchar(32) NOT NULL,
  `data` text NOT NULL,
  `expire` datetime NOT NULL,
  PRIMARY KEY (`session_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci;
*/
namespace Session;
final class DB {
	public $expire = '';

	public function __construct($registry) {
		$this->db = $registry->get('db');

		$this->expire = ini_get('session.gc_maxlifetime');
	}

	public function read($session_id) {
		$query = $this->db->query("SELECT `data` FROM `" . DB_PREFIX . "session` WHERE session_id = '" . $this->db->escape($session_id) . "' AND expire > " . (int)time());

		if ($query->num_rows) {
			return json_decode($query->row['data'], true);
		} else {
			return false;
		}
	}

	public function write($session_id, $data) {
		if ($session_id) {
			$this->db->query("REPLACE INTO `" . DB_PREFIX . "session` SET session_id = '" . $this->db->escape($session_id) . "', `data` = '" . $this->db->escape(json_encode($data)) . "', expire = '" . $this->db->escape(date('Y-m-d H:i:s', time() + $this->expire)) . "'");
		}
		$this->gc();
		return true;
	}

	public function destroy($session_id) {
		$this->db->query("DELETE FROM `" . DB_PREFIX . "session` WHERE session_id = '" . $this->db->escape($session_id) . "'");

		return true;
	}

	public function gc() {
		$date = date('Y-m-d H:i:s', (int)time());
		$sql = "DELETE FROM `" . DB_PREFIX . "session` WHERE expire <= '" . $date . "'";
		$this->db->query($sql);
		return true;
	}
}