php的一个登录的类[推荐]

PHP代码:
/*
* 名称：CnkknD PHP Login Class
* 描述：PHP用于登录的类，基于MySQL
* 作者：Daniel King，cnkknd@163.com
* 日期：2003/8/25
*/

class Login
{
var $username; //用户名
var $userpass; //密码
var $userid; //用户id
var $userlevel; //用户级别

var $authtable="account"; //验证用数据表

var $useCOOKIE=true; //使用COOKIE保存sessionid
var $COOKIEpath='/'; //COOKIE路径
var $COOKIEtime=108000; //COOKIE有效时间

var $err_mysql="mysql error"; //mysql出错提示
var $err_username="username invalid"; //用户名无效提示
var $err_user="user invalid"; //用户无效提示(被封禁)
var $err_password="password error"; //密码错误提示

var $err; //出错提示

var $errorreport=false; //显示错误

function Login($dbserv,$dbport,$dbuser,$dbpass,$dbname) //构造函数,连接数据库
{
if(@mysql_pconnect($dbserv.":".$dbport,$dbuser,$dbpass))
{
mysql_select_db($dbname);
}
else
{
$this->errReport($this->err_mysql);
$this->err=$this->err_mysql;
}
}

function isLoggedin() //判断是否登录
{
if(isset($_COOKIE['sid'])) //如果COOKIE中保存有sid
{
session_id($_COOKIE['sid']);
session_start();
$this->username=$_SESSION['username'];
$this->userid=$_SESSION['userid'];
$this->userlevel=$_SESSION['userlevel'];
return true;
}
else //如果COOKIE中未保存sid,则直接检查session
{
session_start();
if(isset($_SESSION['username']))
return true;
}
return false;
}

function userAuth($username,$userpass) //用户认证
{
$this->username=$username;
$this->userpass=$userpass;
$query="select * from `".$this->authtable."` where `username`='$username';";
$result=mysql_query($query);
if(mysql_num_rows($result)!=0) //找到此用户
{
$row=mysql_fetch_array($result);
if($row['bannd']==1) //此用户被封禁
{
$this->errReport($this->err_user);
$this->err=$this->err_user;
return false;
}
elseif(md5($userpass)==$row['userpass']) //密码匹配
{
$this->userid=$row['id'];
$this->userlevel=$row['userlevel'];
return true;
}
else //密码不匹配
{
$this->errReport($this->err_password);
$this->err=$this->err_password;
return false;
}
}
else //没有找到此用户
{
$this->errReport($this->err_username);
$this->err=$this->err_username;
return false;
}
}

function setSession() //置session
{
$sid=uniqid('sid'); //生成sid
session_id($sid);
session_start();
$_SESSION['username']=$this->username; //给session变量赋值
$_SESSION['userid']=$this->userid; //..
$_SESSION['userlevel']=$this->userlevel; //..
if($this->use_COOKIE) //如果使用COOKIE保存sid
{
if(!setCOOKIE('sid',$sid,time()+$this->COOKIEtime,$this->COOKIEpath))
$this->errReport("set COOKIE failed");
}
else
setCOOKIE('sid','',time()-3600); //清除COOKIE中的sid
}

function userLogout() //用户注销
{
session_start();
unset($_SESSION['username']); //清除session中的username
if(setCOOKIE('sid','',time()-3600))
//清除COOKIE中的sid
return true;
else
return false;
}

function errReport($str) //报错
{
if($this->error_report)
echo "ERROR: $str";
}
}
?>

mysql中表的结构


代码:
CREATE TABLE `account` (
`id` bigint(20) NOT NULL auto_increment,
`username` varchar(255) NOT NULL default '',
`userpass` varchar(255) NOT NULL default '',
`banned` tinyint(1) NOT NULL default '0',
`userlevel` tinyint(4) NOT NULL default '0',
PRIMARY KEY (`id`)
)


使用一例


PHP代码:
include "../myclasses/Login.php";
$dbserv="localhost";
$dbport="3306";
$dbuser="root";
$dbpass="123456";
$dbname="test";

$login=new Login($dbserv,$dbport,$dbuser,$dbpass,$dbname);
$login->error_report=true;
$login->COOKIEtime=3600*24*30;
if($login->isLoggedin())
{
echo $login->username." has aready logged in";
}
elseif($login->userAuth("danielking","1234"))
{
echo "login successfully";
$login->setSession();
}

echo "

...

";

/*
if($login->userLogout())
echo "logged out";
else
echo "logout failed";
*/
?>