Fatal error: Uncaught mysqli_sql_exception: Unknown database 'invoicedb' in T:\Xampp\htdocs\fpdf-source-invoices\invoice-db-form.php:3 Stack trace: #0 T:\Xampp\htdocs\fpdf-source-invoices\invoice-db-form.php(3): mysqli_select_db(Object(mysqli), 'invoicedb') #1 {main} thrown in T:\Xampp\htdocs\fpdf-source-invoices\invoice-db-form.php on line 3