PHP连接数据库代码

<?php
$db = @mysql_connect("localhost","root","root") or die("连接失败");
mysql_select_db("test",$db);
mysql_query("set names utf-8");
$password = md5("liuzhiqiang");
$regdate = time();
$sql = "insert into user2 values(null,'小1王','$password','[e-mail]',$regdate);";
if(!mysql_query($sql,$db)){
    echo "添加数据失败：".mysql_error();
} else {
    echo "添加数据成功！";
}
?>