Update PHP

if($server_version_number > $shop_version_number)
{
    //only make a update if we have enough space
    $update_size    = (3 *(($this->curlGetFileSize(self::$update_address)/1024)/1024));
    $free_space     = $this->getFreeWebspaceSize();

    if($free_space > $update_size)
    {
        //...

        $load_status = $this->loadUpdateFile();

        //check the update file status if ok start backup
        if($load_status)
        {
            exec('mysqldump --host=' . DB_HOST . ' --user=' . DB_USERNAME . ' --password=' . DB_PASSWORD . ' --opt ' . DB_DATABASE . ' > ' . $path . '.sql');

            //...

            $zip_status     = $this->zipFolder($_SERVER['DOCUMENT_ROOT'], self::$zip_exceptions, self::$zip_templates);
            $free_space_bkp = $this->getFreeWebspaceSize();

            if($zip_status && $free_space_bkp > $update_size)
            {
                //now remove the old update files and extract the new ones
                $this->cleanUpdateFilesDir();

                //...

                if($unzip_status)
                {
                    $sql_files  = array_diff(scandir(self::$update_sql_dir), array('.', '..'));
                    $db_status  = -2;

                    if(!empty($sql_files))
                    {
                        foreach($sql_files as $id => $sql_file)
                        {
                            list($file_main, $file_sub, $file_fix, $file_type) = explode('.', $sql_file);

                            $file_version_number = $this->calculateVersionNumber($file_main, $file_sub, $file_fix);

                            if($file_version_number <= $shop_version_number || $file_version_number > $server_version_number)
                            {
                                unset($sql_files[$id]);
                            }
                        }

                        if(!empty($sql_files))
                        {
                            $this->transactionBegin();

                            //variable needed to only rollback in case there was a db update
                            $db_update      = true;
                            $db_response    = $this->doDbUpdate($sql_files);
                            $db_status      = $db_response['status'];
                            $db_rollback    = $db_response['commit'];
                        }
                    }
                    else
                    {
                        //...
                    }

                    if($db_status == -2)
                    {
                        //...
                    }
                    else if($db_status == -1)
                    {
                        //...

                        $error = $this->lang->get_lang('t_error_sql_update', 'Fehler! Das Update konnte aufgrund eines Datenbankfehlers nicht durchgeführt werden.');
                    }
                    else if($db_status == 0)
                    {
                        //...
                    }

                    if($db_status == 0 || $db_status == 1 || $db_status == -2)
                    {
                        $file_status = $this->copyFiles();

                        if($file_status)
                        {
                            $worker_files = array_diff(scandir(self::$update_worker_dir), array('.', '..'));

                            if(!empty($worker_files))
                            {
                                foreach($worker_files as $file)
                                {
                                    list($file_main, $file_sub, $file_fix, $file_type) = explode('.', $file);

                                    $file_version_number = $this->calculateVersionNumber($file_main, $file_sub, $file_fix);

                                    if($file_version_number <= $shop_version_number || $file_version_number > $server_version_number)
                                    {
                                        //...
                                    }
                                    else
                                    {
                                        //...
                                    }
                                }
                            }
                            else
                            {
                                //...
                            }

                            if($db_status !== -2 && $db_rollback === false)//when the rollback is false we do have a transaction to end
                            {
                                try
                                {
                                    $this->transactionEnd();
                                }
                                catch(Exception $e)
                                {
                                    //...
                                }
                            }
                        }
                        else
                        {
                            $file_error = true;
                            $error      = $this->lang->get_lang('t_error_copy_files', 'Fehler beim kopieren der Dateien.');
                        }
                    }
                }
                else
                {
                    $error = $this->lang->get_lang('t_error_extracting_update', 'Fehler! Das Update wurde nicht richtig entpackt.');
                }
            }
            else
            {
                $error = $this->lang->get_lang('t_error_creating_backup', 'Fehler! Das Backup konnte nicht erstellt werden. Bitte sorgen Sie für genug freien Speicher damit das Backup vom Shop erstellt werden kann.');
            }
        }
        else
        {
            $error = $this->lang->get_lang('t_error_loading_update', 'Fehler! Das Update wurde leider nicht richtig geladen bitte versuchen Sie es später nochmal.');
        }
    }
    else
    {
        $error = $this->lang->get_lang('t_not_enough_space', 'Fehler! Es steht leider nicht genug Speicher für ein Update zur Verfügung.');
    }
}
else
{
    //...
}

if($error)
{
    if($db_update)
    {
        $this->transactionCancel();

        if($db_rollback) //implicit commit detected rollback ...
        {
            rename($_SERVER['DOCUMENT_ROOT'] . '/shop_db.php', $_SERVER['DOCUMENT_ROOT'] . '/shop_db.sql');
            exec('mysql --host=mysql5.dr-webshops.de --user=' . DB_USERNAME . ' --password=' . DB_PASSWORD . ' ' . DB_DATABASE . ' < ' . $_SERVER['DOCUMENT_ROOT'] . '/shop_db.sql');
        }
    }

    if($file_error)
    {
        //when there is a file error do a complete restore
        $this->restoreBackup();
    }
    else if($zip_status)
    {
        //an other error occured after we created an backup now we have to delete it
        unlink(self::$local_backup_archive_path . 'shop_backup.zip');
    }
}
else
{
    //generating the htaccess
    $this->generateHtacess();
    $this->setShopVersion(join('.', $server_version));
}