Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in /var/www/html/Mysql.php:30 Stack trace: #0 /var/www/html/Mysql.php(20): Mysql->connect() #1 /var/www/html/Mysql.php(25): Mysql->__construct('db', 'ankieta', 'ankietaAAA38e2(...', 'ankieta') #2 /var/www/html/getTables.inc.php(5): Mysql::getInstance() #3 /var/www/html/cal.php(4): require_once('/var/www/html/g...') #4 {main} thrown in /var/www/html/Mysql.php on line 30