Session.php

<?php
/**
 * This code is licensed under AGPLv3 license or Afterlogic Software License
 * if commercial version of the product was purchased.
 * For full statements of the licenses see LICENSE-AFTERLOGIC and LICENSE-AGPL3 files.
 */

namespace Aurora\System;

/**
 * @license https://www.gnu.org/licenses/agpl-3.0.html AGPL-3.0
 * @license https://afterlogic.com/products/common-licensing Afterlogic Software License
 * @copyright Copyright (c) 2019, Afterlogic Corp.
 *
 * @package Api
 */
class Session
{
    /**
     * @var string
     */
    public static $sSessionName = '';

    /**
     * @var bool
     */
    public static $bFirstStarted = false;

    /**
     * @var bool
     */
    public static $bStarted = false;

    private function __construct() {}

    /**
     * @param string $sKey
     * @return bool
     */
    public static function Has($sKey)
    {
        if (!self::$bFirstStarted) {
            self::Start();
        }
        return (isset($_SESSION[$sKey]));
    }

    /**
     * @param string $sKey
     * @return void
     */
    public static function clear($sKey)
    {
        self::Start();
        unset($_SESSION[$sKey]);
    }

    /**
     * @return void
     */
    public static function ClearAll()
    {
        self::Start();
        $_SESSION = array();
    }

    /**
     * @return void
     */
    public static function Destroy()
    {
        self::Start();
        self::$bStarted = false;
        @session_destroy();
    }

    /**
     * @param string $sKey
     * @param mixed $nmDefault = null
     * @return mixed
     */
    public static function get($sKey, $nmDefault = null)
    {
        if (!self::$bFirstStarted) {
            self::Start();
        }

        return (isset($_SESSION[$sKey])) ? $_SESSION[$sKey] : $nmDefault;
    }

    /**
     * @param string $sKey
     * @param mixed $mValue
     */
    public static function Set($sKey, $mValue)
    {
        self::Start();
        $_SESSION[$sKey] = $mValue;
    }

    /**
     * @return string
     */
    public static function Id()
    {
        self::Start();
        return @session_id();
    }

    /**
     * @param string $sId
     *
     * @return string
     */
    public static function SetId($sId)
    {
        self::Stop();
        @session_id($sId);
        self::Start();
        return @session_id();
    }

    /**
     * @return void
     */
    public static function DestroySessionById($sId)
    {
        self::Stop();
        @session_id($sId);
        self::Start();
        self::Destroy();
    }

    /**
     * @return bool
     */
    public static function Start()
    {
        if (@session_name() !== self::$sSessionName || !self::$bStarted || !self::$bFirstStarted) {
            if (@session_name()) {
                @session_write_close();
                if (isset($GLOBALS['PROD_NAME']) && false !== strpos($GLOBALS['PROD_NAME'], 'Plesk')) { // Plesk
                    @session_module_name('files');
                }
            }

            @session_set_cookie_params(0);
            if (!empty(self::$sSessionName)) {
                @session_name(self::$sSessionName);
            }

            self::$bFirstStarted = true;
            self::$bStarted = true;

            return @session_start();
        }

        return true;
    }

    /**
     * @return void
     */
    public static function Stop()
    {
        if (self::$bStarted) {
            self::$bStarted = false;
            @session_write_close();
        }
    }
}

Session::$sSessionName = AU_API_SESSION_WEBMAIL_NAME;