简单的登录类，没有把登录和数据库查询分开

复制代码 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

复制代码 代码如下:
<"http://my.oschina.net/xinger">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'])"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]) "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;$i<=255;$i++)
        {
            $rndkey[$i]=ord($key[$i%$key_length]);
            $box[$i]=$i;
        }
        for($j=$i=0;$i<256;$i++)
        {
            $j=($j+$box[$i]+$rndkey[$i])%256;
            $tmp=$box[$i];
            $box[$i]=$box[$j];
            $box[$j]=$tmp;
        }
        for($a=$j=$i=0;$i<$string_length;$i++)
        {
            $a=($a+1)%256;
            $j=($j+$box[$a])%256;
            $tmp=$box[$a];
            $box[$a]=$box[$j];
            $box[$j]=$tmp;
            $result.=chr(ord($string[$i])^($box[($box[$a]+$box[$j])%256]));
        }
        if($operation=='D')
        {
            if(substr($result,0,8)==substr(md5(substr($result,8).$key),0,8))
            {
                return substr($result,8);
            }
            else
            {
                return'';
            }
        }
        else
        {
            return str_replace('=','',base64_encode($result));
        }
    }
    public function get_ip() {
        return $_SERVER['REMOTE_ADDR'];
    }
}
?>

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