Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, bool given in /var/www/html/exam-centers.php:98
Stack trace:
#0 /var/www/html/exam-centers.php(98): mysqli_query(false, 'SELECT * FROM b...')
#1 {main}
thrown in /var/www/html/exam-centers.php on line 98