PHP simple session class code

The code is as follows:

<?php 
class session 
{ 
static $sessionObject; 
/* $_SESSION[&#39;user&#39;] == 0 , don&#39;t work . 
* == 1 , he is really user . 
*/ 
private function __construct() 
{ 
if(! ( isset($_SESSION[&#39;user&#39;]) && $_SESSION[&#39;user&#39;]==0 )) 
session_set_cookie_params(3600); 
session_start(); //Initialize14 }15 private function __clone() 
{ 
} 
public static function getObject() 
{ 
if(! self::$sessionObject instanceof self) 
$sessionObject = new session() ; 
return $sessionObject; 
} 
public function set_false() 
{ 
$_SESSION[&#39;user&#39;] = 0 ; // for PHP>=5 
} 
public function set_true() 
{ 
if( isset($_SESSION[&#39;user&#39;]) ) 
$_SESSION[&#39;user&#39;] = 1 ; 
else 
$this->error(); 
} 
public function get_status() 
{ 
return $_SESSION[&#39;user&#39;]; 
} 
public function end_session() 
{ 
session_destroy(); 
} 
public function error() 
{ 
} 
} 
?>

Approximate usage
example:
log in page: $session = session::getObject();
$session->set_ture(); // if $row['password'] ==
next page:
Copy code The code is as follows:
$session = session::getObject();
if($session->get_status())
// .... the user is really
else
// . ...

log out: $session = session::getObject();
$session->end_session();
Return by get_status() whether the current user is logged in effectively