读取 mysql binlog 开始和结束时间(4)

        }
        $next_filename = substr($buf, $i + 1);
 
        $head_str = substr($buf, $i + 1 - $size_pos - self::EVENT_HEAD_SIZE, self::EVENT_HEAD_SIZE);
        $head = unpack($this->eventHeadPackStr, $head_str);
        if ($head['type_code'] != self::ROTATE_EVENT) {
            return null;
        }
        return array('head'=>$head, 'nextFile'=>$next_filename);
    }
 
    /**
     * @param string $path path to binlog file
     */
    function read($path) {
        $file = fopen($path, 'r');
        if (!$file) {
            return null;
        }
        if (!$this->isBinlog($file)) {
            fclose($file);
            return null;
        }
 
        $fde = $this->readFormatDescriptionEvent($file);
        $re = $this->readRotateEvent($file);
        fclose($file);
        return array(
            'beginAt' => $fde['head']['timestamp'],
            'endAt' => $re['head']['timestamp'],
            'nextFile' => $re['nextFile'],
            'serverVersion' => $fde['data']['server_version'],
        );
    }
}