Fatal error: Uncaught ArgumentCountError: mysqli_select_db() expects exactly 2 arguments, 1 given in C:\inetpub\vhosts\w3tutor.in\httpdocs\classes.php:7 Stack trace: #0 C:\inetpub\vhosts\w3tutor.in\httpdocs\classes.php(7): mysqli_select_db() #1 C:\inetpub\vhosts\w3tutor.in\httpdocs\index.php(3): tutor->__construct() #2 {main} thrown in C:\inetpub\vhosts\w3tutor.in\httpdocs\classes.php on line 7