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
[U]复制代码[/U] 代码如下:
/*
*   例子
*
*  $Auth=new Auth();
*  $Auth->login("123@123.com","123");
*  $Auth->logout();
*  echo $r->init();     
*
**/
验证登陆类
[U]复制代码[/U] 代码如下:
set($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;
        $this->cookie_where      = isset($config['cookie_where'])?$config['cookie_where']:'/';
        $this->cookie_domain = isset($config['cookie_domain'])?$config['cookie_domain']:'';
        $this->cookie_secure = isset($config['cookie_secure'])?$config['cookie_secure']:'';
        $this->select_uid        = isset($config['select_uid'])?$config['select_uid']:'uid';
        $this->select_table      = isset($config['select_table'])?$config['select_table']:'table';
        $this->select_usersname  = isset($config['select_usersname'])?$config['select_usersname']:'user_name';
        $this->select_password   = isset($config['select_password'])?$config['select_password']:'password';
        $this->salt              = isset($config['salt'])?$config['salt']:'sghsdghsdg';//
        $this->guest_name        = isset($config['guest_name'])?$config['guest_name']:'Guest';//
        $this->pre               = isset($config['auth'])?$config['auth']:'auth_';
        $this->depr              = isset($config['depr'])?$config['depr']:'-';
    }
    //
    public function init(){
        $this->user_id       = 0;
        $this->username      = $this->guest_name;
        $this->ok            = false;
        if(!$this->check_session()){
            $this->check_cookie();
        }
        return $this->ok;
    }
    //验证SESSION
    private function check_session(){
        if(!empty($_SESSION[$this->pre_username])&&!empty($_SESSION[$this->pre_password])){
            return $this->check($_SESSION[$this->pre_username],$_SESSION[$this->pre_password]);
        } else {
            return false;
        }
    }
    //验证COOKIE
    private function check_cookie(){
        if(!empty($_COOKIE[$this->pre_username])&&!empty($_COOKIE[$this->pre_password])){
            return $this->check($_COOKIE[$this->pre_username],$_COOKIE[$this->pre_password]);
        } else {
            return false;
        }
    }
    //登陆
    public function login($username,$password){
        $sql    = "select ".$this->select_uid." from ".$this->select_table." where ".$this->select_usersname."='$username' and ".$this->select_password."='$password'";
        $result = mysql_query($sql);
        $rows   = mysql_num_rows($sql);
        if($rows==1){
            $this->user_id   = mysql_result($result,0,0);
            $this->username  = $username;
            $this->ok        = true;
            $username   = $username.$this->depr.$this->get_ip();
            $user_name  = $this->encrypt($username,'E',$this->salt);
            $_SESSION[$this->pre_username]=$user_name;
            $_SESSION[$this->pre_password]=md5(md5($password,$this->salt));
            setcookie($this->pre_username,$user_name,time()+$this->cookie_time,$this->cookie_where,$this->cookie_domain,$this->cookie_secure);
            setcookie($this->pre_password,md5(md5($password,$this->salt)),time()+$this->cookie_time,$this->cookie_where,$this->cookie_domain,$this->cookie_secure);
            return true;
        }
        return false;
    }
    //验证
    private function check($username,$password){
        $user_name  = $this->encrypt($username,'D',$this->salt);
        $name       = explode($this->depr, $user_name);
        $username   = $name[0];
        $ip         = isset($name[1]) ? $name[1] : NULL;
        if($ip !== $this->get_ip()) return false;
        static $vars = array();
        if(!empty($vars)&&is_array($vars)&&isset($vars[$username.$password])){
            $this->user_id   = $vars['user_id'];
            $this->username  = $vars['username'];
            $this->ok        = $vars['ok'];
            return true;
        }
        $sql    = "select ".$this->select_uid.",".$this->select_password." from ".$this->select_table." where ".$this->select_usersname."='$username'";
        $query  = mysql_query($sql);
        $result = mysql_fetch_array($query);
        $row    = mysql_num_rows($sql);
        if($row == 1){
            $db_password=$result[$this->select_password];
            if(md5(md5($db_password,$this->salt)) == $password){
                $this->user_id   = $vars['user_id']  = $result[$this->select_uid];
                $this->username  = $vars['username'] = $username;
                $this->ok        = $vars['ok']       = true;
                $vars[$username.$password]          = md5($username.$password);
                return true;
            }
        }
        return false;
    }
    //退出
    public function logout(){
        $this->user_id       = 0;
        $this->username      = $this->guest_name;
        $this->ok            = false;
        $_SESSION[$this->pre_username]="";
        $_SESSION[$this->pre_password]="";
        setcookie($this->pre_username,"",time()-$this->cookie_time,$this->cookie_where,$this->cookie_domain,$this->cookie_secure);
        setcookie($this->pre_password,"",time()-$this->cookie_time,$this->cookie_where,$this->cookie_domain,$this->cookie_secure);
    }   
    //加密
    public function encrypt($string,$operation,$key='') {
        $key=md5($key);
        $key_length=strlen($key);
        $string=$operation=='D'?base64_decode($string):substr(md5($string.$key),0,8).$string;
        $string_length=strlen($string);
        $rndkey=$box=array();
        $result='';
        for($i=0;$i
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