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Warning: Trying to access array offset on null in /var/www/html/projects/ivth_header.php on line 4

Warning: Undefined variable $dbh in /var/www/html/projects/ivth_header.php on line 8

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /var/www/html/projects/ivth_header.php:8 Stack trace: #0 /var/www/html/projects/ivth_header.php(8): mysqli_query() #1 {main} thrown in /var/www/html/projects/ivth_header.php on line 8