新人求教php连接不上数据库有关问题

新人求教php连接不上数据库问题！
代码如下

PHP code

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<?php>

$conn=MySql_connect("localhost","root","root") or die("connect fail".MySql_error());
echo"<p>success</p>";
$ok=MySql_select_db("test",$conn);
if($ok)
{
echo "<p>数据库选择成功</p>";
}
else
{
echo "<p>选择失败</p>";
}
?>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title></title>