Contao\Automator::rotateLogs PHP Method

    public function rotateLogs()
    {
        @trigger_error('Using Automator::rotateLogs() has been deprecated and will no longer work in Contao 5.0. Use the logger service instead, which rotates its log files automatically.', E_USER_DEPRECATED);
        $arrFiles = preg_grep('/\\.log$/', scan(TL_ROOT . '/system/logs'));
        foreach ($arrFiles as $strFile) {
            $objFile = new \File('system/logs/' . $strFile . '.9');
            // Delete the oldest file
            if ($objFile->exists()) {
                $objFile->delete();
            }
            // Rotate the files (e.g. error.log.4 becomes error.log.5)
            for ($i = 8; $i > 0; $i--) {
                $strGzName = 'system/logs/' . $strFile . '.' . $i;
                if (file_exists(TL_ROOT . '/' . $strGzName)) {
                    $objFile = new \File($strGzName);
                    $objFile->renameTo('system/logs/' . $strFile . '.' . ($i + 1));
                }
            }
            // Add .1 to the latest file
            $objFile = new \File('system/logs/' . $strFile);
            $objFile->renameTo('system/logs/' . $strFile . '.1');
        }
    }