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PHP手册中说,Session_start()之前应没有任何输出,否则就出错。那么我现在想做一个用户登录的类,这个类中有很多函数涉及Session_start(),如:初始化用户登录函数,判断是否已经登录函数。那么我怎么写这个Session_start()它才能不报错呢?
有个现成的class可以看一下效果:
<?php
class operateLogin
{
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=3600*24*365; //cookie有效时间
var $err_mysql="MySQL错误"; //mysql出错提示
var $err_username="无效用户名"; //用户名无效提示
var $err_user="无效用户"; //用户无效提示(被封禁)
var $err_password="密码错误"; //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($_COOKIE['sid'])) { //如果cookie中保存有sid
session_start();
session_id($_COOKIE['sid']);
$this->username=$_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))
$this->errReport("set cookie failed");
} else {
setcookie('sid','',time()-3600*24*365); //清除cookie中的sid
}
}
function userLogout() { //用户注销
session_start();
unset($_SESSION['username']); //清除session中的username
if(setcookie('sid','',time()-3600*24*365)) //清除cookie中的sid
return true;
else
return false;
}
function errReport($str) { //报错
if($this->error_report)
echo "ERROR: $str";
}
}
?>
[ 本帖最后由 fisherjams 于 2008-3-6 22:12 编辑 ] |
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