简单的会话类

这算是草稿吧，很简单，稍后再去看一些session讲解。All right ,上代码

 1 <?php
 2   class session
 3   {
 4         static $sessionObject;
 5       /*  $_SESSION['user'] == 0 , don't work .
 6        *  == 1 ,   he is really user .
 7       */
 8       private function __construct()
 9       {
10           if(! ( isset($_SESSION['user']) && $_SESSION['user']==0 ))
11                session_set_cookie_params(3600);
12 
13           session_start();                   //Initialize

14       }

15       private function __clone()
16       {
17       }
18       public static function getObject()
19       {
20             if(! self::$sessionObject instanceof self)
21                  $sessionObject = new session() ;
22 
23             return $sessionObject;
24       }
25 
26       public function set_false()
27       {
28              $_SESSION['user'] = 0 ;     // for PHP>=5
29       }
30       public function set_true()
31       {
32            if( isset($_SESSION['user']) )
33                  $_SESSION['user'] = 1 ;
34              else
35                  $this->error();
36       }
37       public function get_status()
38       {
39              return $_SESSION['user'];
40       }
41       public function end_session()
42       {
43              session_destroy();
44       }
45       public function error()
46       {
47 
48       }
49   }
50 ?>

　　大概用法

  example :

         log in page : $session = session::getObject();

                            $session->set_ture();             // if   $row['password'] == 

         next page :   

                 $session = session::getObject();
                        if($session->get_status())
                                   // .... the user is really
                        else
                                   // ....

　　

         log out :       $session = session::getObject();

                            $session->end_session();

  

        由get_status()返回当前用户是否有效登录