Fatal error: Uncaught mysqli_sql_exception: Unknown database 'mainweb' in C:\xampp\htdocs\admin\functions\db.php:18 Stack trace: #0 C:\xampp\htdocs\admin\functions\db.php(18): mysqli_connect('localhost', 'root', Object(SensitiveParameterValue), 'mainweb') #1 C:\xampp\htdocs\functions\blog.php(6): require('C:\\xampp\\htdocs...') #2 C:\xampp\htdocs\blog.php(1): require_once('C:\\xampp\\htdocs...') #3 {main} thrown in C:\xampp\htdocs\admin\functions\db.php on line 18