Warning: PDO::__construct(): MySQL server has gone away in /www/wwwroot/www.mfydw.com/include/db.php on line 3

Warning: PDO::__construct(): Error while reading greeting packet. PID=2256 in /www/wwwroot/www.mfydw.com/include/db.php on line 3

Fatal error: Uncaught exception 'Exception' with message 'SQLSTATE[HY000] [2006] MySQL server has gone away' in /www/wwwroot/www.mfydw.com/include/db.php:3
Stack trace:
#0 /www/wwwroot/www.mfydw.com/include/function.php(21): Db->__construct(Array)
#1 /www/wwwroot/www.mfydw.com/include/book.php(8): D()
#2 /www/wwwroot/www.mfydw.com/action/chapter.php(10): bookInfo(29137)
#3 /www/wwwroot/www.mfydw.com/index.php(16): include('/www/wwwroot/ww...')
#4 {main}
  thrown in /www/wwwroot/www.mfydw.com/include/db.php on line 3