Handler.php

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<?php
/*
 You may not change or alter any portion of this comment or credits
 of supporting developers from this source code or any supporting source code
 which is considered copyrighted (c) material of the original comment or credit authors.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/

namespace Xoops\Core\Session;

class Handler implements \SessionHandlerInterface
{
    private $db;

    private $sessionTable = 'system_session';

    public function __construct()
    {
        $this->db = \Xoops::getInstance()->db();
    }

    public function open($save_path, $name)
    {
        return true;
    }

    public function close()
    {
        return true;
    }

    public function read($session_id)
    {
        $qb = $this->db->createXoopsQueryBuilder();
        $eb = $qb->expr();
        $qb ->select('s.session_data')
            ->fromPrefix($this->sessionTable, 's')
            ->where($eb->eq('s.session_id', ':sessid'))
            ->andWhere($eb->gt('s.expires_at', ':expires'))
            ->setParameter(':sessid', $session_id, \PDO::PARAM_STR)
            ->setParameter(':expires', time(), \PDO::PARAM_INT);

        $session_data = '';
        if ($result = $qb->execute()) {
            if ($row = $result->fetch(\PDO::FETCH_NUM)) {
                list ($session_data) = $row;
            }
        }

        // if system is not configured for garbage collect, force it anyway
        if ((ini_get('session.gc_probability') == 0) && (rand(1, 100) <= 5)) {
            $this->gc(0);
        }

        return $session_data;
    }

    public function write($session_id, $session_data)
    {
        $expires =  (isset($_SESSION['SESSION_MANAGER_EXPIRES']))
            ? intval($_SESSION['SESSION_MANAGER_EXPIRES'])
            : time() + (session_cache_expire() * 60);
        $qb = $this->db->createXoopsQueryBuilder();
        $eb = $qb->expr();
        $qb ->updatePrefix($this->sessionTable)
            ->set('expires_at', ':expires')
            ->set('session_data', ':sessdata')
            ->where($eb->eq('session_id', ':sessid'))
            ->setParameter(':sessid', $session_id, \PDO::PARAM_STR)
            ->setParameter(':expires', $expires, \PDO::PARAM_INT)
            ->setParameter(':sessdata', $session_data, \PDO::PARAM_STR);
        $this->db->setForce(true);
        $result = $qb->execute();
        if ($result<=0) {
            $qb = $this->db->createXoopsQueryBuilder();
            $qb ->insertPrefix($this->sessionTable)
                ->values(array(
                    'session_id'   => ':sessid',
                    'expires_at'   => ':expires',
                    'session_data' => ':sessdata',
                    ))
                ->setParameter(':sessid', $session_id, \PDO::PARAM_STR)
                ->setParameter(':expires', $expires, \PDO::PARAM_INT)
                ->setParameter(':sessdata', $session_data, \PDO::PARAM_STR);
            $this->db->setForce(true);
            $result = $qb->execute();
        }

        return ($result);
    }

    public function destroy($session_id)
    {
        $qb = $this->db->createXoopsQueryBuilder();
        $eb = $qb->expr();
        $qb ->deletePrefix($this->sessionTable)
            ->where($eb->eq('session_id', ':sessid'))
            ->setParameter(':sessid', $session_id, \PDO::PARAM_STR);
        $this->db->setForce(true);
        return $qb->execute();
    }

    public function gc($maxlifetime)
    {
        $mintime = time();
        $qb = $this->db->createXoopsQueryBuilder();
        $eb = $qb->expr();
        $qb ->deletePrefix($this->sessionTable)
            ->where($eb->lt('expires_at', ':expires'))
            ->setParameter(':expires', $mintime, \PDO::PARAM_INT);
        $this->db->setForce(true);
        return $qb->execute();
    }
}