There is no conn.php data path connection file

Question

There is no conn.php data path connection file, there is no way to refer to it, I wrote one myself and don’t use it very much

Answer 1

I tried it but it still doesn’t work

Why

Answer 2

<?php
$conn=mysql_connect('localhost','用户名','密码') or die("error connecting") ; //连接数据库
mysql_query("set names 'utf8'");
mysql_select_db('数据库名'); //选择数据库