php简单的会话类代码

复制代码 代码如下:
<?php
class session
{
static $sessionObject;
/* $_SESSION['user'] == 0 , don't work .
* == 1 , he is really user .
*/
private function __construct()
{
if(! ( isset($_SESSION['user']) && $_SESSION['user']==0 ))
session_set_cookie_params(3600);

session_start(); //Initialize14 }15 private function __clone()
{
}
public static function getObject()
{
if(! self::$sessionObject instanceof self)
$sessionObject = new session() ;

return $sessionObject;
}

public function set_false()
{
$_SESSION['user'] = 0 ; // for PHP>=5
}
public function set_true()
{
if( isset($_SESSION['user']) )
$_SESSION['user'] = 1 ;
else
$this->error();
}
public function get_status()
{
return $_SESSION['user'];
}
public function end_session()
{
session_destroy();
}
public function error()
{

}
}
?>

大概用法
example :
log in page : $session = session::getObject();
$session->set_ture(); // if $row['password'] ==
next page :
复制代码 代码如下:
$session = session::getObject();
if($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