php连接mysqli

A PHP Error was encountered
Severity: Warning

Message: mysqli::real_connect(): (HY000/1045): Access denied for user 'fd_silusen811_co'@'localhost' (using password: YES)

Filename: mysqli/mysqli_driver.php

Line Number: 202

Backtrace:

File: /www/wwwroot/fd/app/controllers/Welcome.php
Line: 11
Function: library

File: /www/wwwroot/fd/index.php
Line: 158
Function: require_once

A Database Error Occurred
Unable to connect to your database server using the provided settings.

Filename: libraries/Session/Session.php

Line Number: 103

自己做好了网站，数据库我复制了我之前的，现在打不开