PHP 登录类 

 1 class Auth
 2 {
 3     var $user_id;
 4     var $username;
 5     var $password;
 6     var $ok;
 7     var $salt = "34asdf34";
 8     var $domain = ".domain.com";
 9  
10     function Auth()
11     {
12         global $db;
13  
14         $this->user_id = 0;
15         $this->username = "Guest";
16         $this->ok = false;
17  
18         if(!$this->check_session()) $this->check_cookie();
19  
20         return $this->ok;
21     }
22  
23     function check_session()
24     {
25         if(!empty($_SESSION['auth_username']) && !empty($_SESSION['auth_password']))
26             return $this->check($_SESSION['auth_username'], $_SESSION['auth_password']);
27         else
28             return false;
29     }
30  
31     function check_cookie()
32     {
33         if(!empty($_COOKIE['auth_username']) && !empty($_COOKIE['auth_password']))
34             return $this->check($_COOKIE['auth_username'], $_COOKIE['auth_password']);
35         else
36             return false;
37     }
38  
39     function login($username, $password)
40     {
41         global $db;
42         $db->query("SELECT user_id FROM users WHERE username = '$username' AND password = '$password'");
43         if(mysql_num_rows($db->result) == 1)
44         {
45             $this->user_id = mysql_result($db->result, 0, 0);
46             $this->username = $username;
47             $this->ok = true;
48  
49             $_SESSION['auth_username'] = $username;
50             $_SESSION['auth_password'] = md5($password . $this->salt);
51             setcookie("auth_username", $username, time()+60*60*24*30, "/", $this->domain);
52             setcookie("auth_password", md5($password . $this->salt), time()+60*60*24*30, "/", $this->domain);
53  
54             return true;
55         }
56         return false;
57     }        
58  
59     function check($username, $password)
60     {
61         global $db;
62         $db->query("SELECT user_id, password FROM users WHERE username = '$username'");
63         if(mysql_num_rows($db->result) == 1)
64         {
65             $db_password = mysql_result($db->result, 0, 1);
66             if(md5($db_password . $this->salt) == $password)
67             {
68                 $this->user_id = mysql_result($db->result, 0, 0);
69                 $this->username = $username;
70                 $this->ok = true;
71                 return true;
72             }
73         }            
74         return false;
75     }
76  
77     function logout()
78     {
79         $this->user_id = 0;
80         $this->username = "Guest";
81         $this->ok = false;
82  
83         $_SESSION['auth_username'] = "";
84         $_SESSION['auth_password'] = "";
85  
86         setcookie("auth_username", "", time() - 3600, "/", $this->domain);
87         setcookie("auth_password", "", time() - 3600, "/", $this->domain);
88     }
89  
90 }

 

posted @ 2016-08-14 15:20  沙瑞金书记  阅读(288)  评论(0)  编辑  收藏  举报