http://localhost/test.php

<?php
//
$host = "localhost";
$user = "root";
$password = "root";//12345改成你的mysql密码
$link=mysql_connect($host,$user,$password);
if(!$link) echo "<h1>失败!</h1>";
else echo "<h1>成功!</h1>";
mysql_close();
?>

Warning: mysql_connect() [function.mysql-connect]: Access denied for user 'root'@'localhost' (using password: YES) in D:/www/test.php on line 6

失败!

Warning: mysql_close(): no MySQL-Link resource supplied in D:/www/test.php on line 9

密码错误！！！！！

成功!