Warning: PDO::query(): MySQL server has gone away in /htdocs/header.php on line 2

Warning: PDO::query(): Error reading result set's header in /htdocs/header.php on line 2

Fatal error: Uncaught Error: Call to a member function fetch() on boolean in /htdocs/header.php:3 Stack trace: #0 /htdocs/abstract.php(3): include() #1 {main} thrown in /htdocs/header.php on line 3