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//старт сессии
function Sessions_Start () {
        global $SecureKey, $SecureCookieName, $NumIPRanks, $AuthSalt;
 
    $LifeTime = 0; 
    $Path = '/';
    $Domain = '';
    $Secure = FALSE;
    $HttpOnly = TRUE;
    session_set_cookie_params($LifeTime, $Path, $Domain, $Secure, $HttpOnly);
        
        session_start ();
        
        if (!isset ($_SESSION['UserData'])) {
                $_SESSION['UserData'] = array ();
                $_SESSION['UserData']['UserType'] = 'guest';    
        }
        else{
                $Type = $_SESSION['UserData']['UserType'];
                $SessionValidator = 0;
                
                if ($Type == 'member') {
                        if (!isset ($_SESSION['UserData']['UserID']) or !isset ($_SESSION['UserData']['UserName']) or!isset ($_SESSION['UserData']['GroupID']) or!isset ($_SESSION['UserData'][$SecureKey]) or!isset ($_SESSION['UserData'][$SecureCookieName])) {
                                $SessionValidator++;
                        }
                        
                        if (!isset ($_COOKIE[$SecureCookieName])) {
                                $SessionValidator++;
                        }                       
                        
                        //секретная строка
                        $IPArray = explode ('.', $_SERVER['REMOTE_ADDR']);
                        $IPRanks = array ();
                        for ($i=0; $i < $NumIPRanks; $i++) {
                                $IPRanks[] = $IPArray[$i];
                        }
                        $IPFinalString = sha1 (implode ('.', $IPRanks) . $AuthSalt);
                        $CurUserAgent = sha1 (substr ($_SERVER['HTTP_USER_AGENT'], 0, 50) . $AuthSalt);
                        $SecureString = sha1 ($IPFinalString . $CurUserAgent . $AuthSalt);
                        
                        if ($_SESSION['UserData'][$SecureKey] <> $SecureString) {
                                $SessionValidator++;
                        }
                        
                        if ($_SESSION['UserData'][$SecureCookieName] <> $_COOKIE[$SecureCookieName]) {
                                $SessionValidator++;
                        }
                        
                        if ($SessionValidator > 0) {
                                session_regenerate_id ();
                                $_SESSION['UserData'] = array ();
                                $_SESSION['UserData']['UserType'] = 'guest';
                        }
                        
                }
        }       
        return (session_id ());
}