Fatal error: Uncaught mysqli_sql_exception: Unknown database 'zq_user' in D:\xampp\htdocs\bbs\api\reg.php:3 Stack trace: #0 D:\xampp\htdocs\bbs\api\reg.php(3): mysqli_connect('localhost', 'root', '', 'zq_user') #1 {main} thrown in D:\xampp\htdocs\bbs\api\reg.php on line 3