Warning: Cannot modify header information - headers already sent by (output started at /customers/d/2/d/oblates.se/httpd.www/liturgi/Yvek.php:1) in /customers/d/2/d/oblates.se/httpd.www/liturgi/Yvek.php on line 3

Warning: Undefined variable $dat in /customers/d/2/d/oblates.se/httpd.www/liturgi/Yvek.php on line 30

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, bool given in /customers/d/2/d/oblates.se/httpd.www/liturgi/Yvek.php:42
Stack trace:
#0 /customers/d/2/d/oblates.se/httpd.www/liturgi/Yvek.php(42): mysqli_query(false, 'SELECT dat.*, l...')
#1 {main}
  thrown in /customers/d/2/d/oblates.se/httpd.www/liturgi/Yvek.php on line 42