Fatal error: Uncaught PDOException: SQLSTATE[HY000] [2006] MySQL server has gone away in /var/www/rcnit/data/www/fdzk.petrsu.ru/db.php:18 Stack trace: #0 /var/www/rcnit/data/www/fdzk.petrsu.ru/index.php(2): require() #1 {main} thrown in /var/www/rcnit/data/www/fdzk.petrsu.ru/db.php on line 18