public static function writelog($file, $log) {

        global $_G;

        $yearmonth = dgmdate(TIMESTAMP, 'Ym', $_G['setting']['timeoffset']);

        $logdir = DISCUZ_ROOT.'./data/log/';

        $logfile = $logdir.$yearmonth.'_'.$file.'.php';

        if(@filesize($logfile) > 2048000) { //判断文件大小，如果超过2M，则将日志文件重命名

            $dir = opendir($logdir);

            $length = strlen($file);

            $maxid = $id = 0;

            while($entry = readdir($dir)) {

                if(strpos($entry, $yearmonth.'_'.$file) !== false) {

                    $id = intval(substr($entry, $length + 8, -4));

                    $id > $maxid && $maxid = $id;

                }

            }

            closedir($dir);

            $logfilebak = $logdir.$yearmonth.'_'.$file.'_'.($maxid + 1).'.php';

            @rename($logfile, $logfilebak);

        }

        if($fp = @fopen($logfile, 'a')) {

            @flock($fp, 2);//文件锁

            if(!is_array($log)) {

                $log = array($log);

            }

            foreach($log as $tmp) {

                fwrite($fp, "<?PHP exit;?>\t".str_replace(array('<?', '?>'), '', $tmp)."\n");

            }

            fclose($fp);

        }

    }