PHP 验证登陆类分享

简单的登录类，没有把登录和数据库查询分开

代码如下:
/*
 *   例子
 *
 *  $Auth=new Auth();
 *  $Auth->login("123@123.com","123");
 *  $Auth->logout();
 *  echo $r->init();    
 *
**/

验证登陆类

代码如下:
<?php
/*
 *
 * @ID:      验证登陆类
 *
 * @class:   Auth.class.php
 *
 * @auther:  欣儿
 *
 * @time:    2015/03/12
 *
 * @web:     http://my.oschina.net/xinger
 *
**/
class Auth {
    //外部设置
    //cookie设置
    var $cookie_time;//         7200
    var $cookie_where;//        '/'
    var $cookie_domain;//       'yourweb.com'
    var $cookie_secure;//       1和0
    //数据库设置    
    var $select_uid;//          'uid'
    var $select_table;//        'user'
    var $select_usersname;//    'email'
    var $select_password;//     'password'
    //盐
    var $salt;//                "12332"
    var $guest_name;//          'Guest'
    //用户获取值
    var $user_id;
    var $username;
    var $ok;
    var $pre;//                 'auth_'
    var $depr;//                '-'
    //内部变量
    private $pre_username;
    private $pre_password;
    public function __construct($config=array()){
        $this->set($config);
        $this->pre_username=sha1(md5($this->pre.'username'));
        $this->pre_password=sha1(md5($this->pre.'password'));
    }
    public function set($config){
        $this->cookie_time       = isset($config['cookie_time'])?$config['cookie_time']: 7200;