<?
/*
* 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
使用一例


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