mysql 测试php连接问题

<?php
$servername = "shuhua.dbhost";
$username = "shuhua_user";
$password = "shuhua";

// 创建连接
$conn = new mysqli($servername, $username, $password);

// 检测连接
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
echo "连接成功";
?>