php 登陆验证类功能实例

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/**
 * 用户登陆验证的类
 *
 * @param 
 * @arrange （www.idcnote.com）
 **/
class Auth
{
 var $user_id;
 var $username;
 var $password;
 var $ok;
 var $salt = "34asdf34";
 var $domain = ".domain.com";
 
 function Auth()
 {
  global $db;
 
  $this->user_id = 0;
  $this->username = "Guest";
  $this->ok = false;
 
  if(!$this->check_session()) $this->check_cookie();
 
  return $this->ok;
 }
 
 function check_session()
 {
  if(!empty($_SESSION['auth_username']) && !empty($_SESSION['auth_password']))
   return $this->check($_SESSION['auth_username'], $_SESSION['auth_password']);
  else
   return false;
 }
 
 function check_cookie()
 {
  if(!empty($_COOKIE['auth_username']) && !empty($_COOKIE['auth_password']))
   return $this->check($_COOKIE['auth_username'], $_COOKIE['auth_password']);
  else
   return false;
 }
 
 function login($username, $password)
 {
  global $db;
  $db->query("SELECT user_id FROM users WHERE username = '$username' AND password = '$password'");
  if(mysql_num_rows($db->result) == 1)
  {
   $this->user_id = mysql_result($db->result, 0, 0);
   $this->username = $username;
   $this->ok = true;
 
   $_SESSION['auth_username'] = $username;
   $_SESSION['auth_password'] = md5($password . $this->salt);
   setcookie("auth_username", $username, time()+60*60*24*30, "/", $this->domain);
   setcookie("auth_password", md5($password . $this->salt), time()+60*60*24*30, "/", $this->domain);
 
   return true;
  }
  return false;
 }  
 
 function check($username, $password)
 {
  global $db;
  $db->query("SELECT user_id, password FROM users WHERE username = '$username'");
  if(mysql_num_rows($db->result) == 1)
  {
   $db_password = mysql_result($db->result, 0, 1);
   if(md5($db_password . $this->salt) == $password)
   {
    $this->user_id = mysql_result($db->result, 0, 0);
    $this->username = $username;
    $this->ok = true;
    return true;
   }
  }   
  return false;
 }
 
 function logout()
 {
  $this->user_id = 0;
  $this->username = "Guest";
  $this->ok = false;
 
  $_SESSION['auth_username'] = "";
  $_SESSION['auth_password'] = "";
 
  setcookie("auth_username", "", time() - 3600, "/", $this->domain);
  setcookie("auth_password", "", time() - 3600, "/", $this->domain);
 }
 
}


/***   来自php教程（www.idcnote.com）   ***/

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