Fatal error: Uncaught mysqli_sql_exception: Unknown database 'data' in C:\xampp\htdocs\InsertDataWithPHP\connection.php:2 Stack trace: #0 C:\xampp\htdocs\InsertDataWithPHP\connection.php(2): mysqli_connect('localhost', 'root', Object(SensitiveParameterValue), 'data') #1 C:\xampp\htdocs\InsertDataWithPHP\index.php(2): require('C:\\xampp\\htdocs...') #2 {main} thrown in C:\xampp\htdocs\InsertDataWithPHP\connection.php on line 2