public static function init()
{
if (isset($_COOKIE['SESSID'])) {
if (UserSession::exists(array('session_id' => $_COOKIE['SESSID']))) {
$session = User::find_by_id(UserSession::find_by_session_id($_COOKIE['SESSID'])->user_id);
session_id($_COOKIE['SESSID']);
self::set($session);
} else {
setcookie("SESSID", "", -1);
self::set(-1);
}
session_start();
}
UserSession::delete_all(array('conditions' => array('expiration < ?', Utils::tps())));
}