PHP failed to connect to database server

php failed to connect to the database server?

conn.php代码如下：

<?php
//连接MySQL服务器，选择数据库
$conn=mysqli_connect("localhost", "root", "root", "cloth_system") or die("连接数据库服务器失败！".mysqli_error());
//设置数据库编码格式utf8
mysqli_query($conn,"set names utf8");
?>

index.php代码如下：

......
<!--top-->

<!--main-->
<?php
include_once("conn/conn.php"); //连接到数据库
?>

Solution:

Run conn.php directly to see the error message, and then make corresponding modifications based on the error message.

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