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<?php

class Session
{
    function Session($expire = 0, $readOnly = false) {
        if($readOnly)   {
            // session_readonly();
        }
        else
        {
            session_set_cookie_params($expire);
            session_start();
        }
    }

    function SetVar($name, $value)
    {
        if( !isset($name) || !isset($value) )
            die("To few params from session::setVar");
        if( phpversion() >= "4.1.0" ) {
            $_SESSION[$name] = $value;
            if( !isset($GLOBALS[$name]) )
                $GLOBALS[$name] = $value;
        }
        else {
            global $HTTP_SESSION_VARS;
            session_register($name);
            $GLOBALS['HTTP_SESSION_VARS'][$name] = $value;
            if( !isset($GLOBALS[$name]) )
                $GLOBALS[$name] = $value;
        }
    }

    function IsRegistered($name)
    {
        if( phpversion() >= "4.1.0" )
        {
            if (isset($GLOBALS[$name]))
                return true;
            elseif (isset($GLOBALS['_SESSION'][$name]))
                return true;
        }
        else
        {
            if (isset($GLOBALS[$name]))
                return true;
            elseif (isset($GLOBALS['HTTP_SESSION_VARS'][$name]))
                return true;
        }
        return false;
    }

    function GetVar( $name ) {
        if( !isset($name) )
            die("To few parameters from session::getVar");

        if( phpversion() >= "4.1.0" )
        {
            if (isset($GLOBALS[$name]))
                return $GLOBALS[$name];
            elseif (isset($GLOBALS['_SESSION'][$name]))
            {
                $GLOBALS[$name] = $GLOBALS['_SESSION'][$name];
                return $GLOBALS['_SESSION'][$name];
            }
        }
        else
        {
            if (isset($GLOBALS[$name]))
                return $GLOBALS[$name];
            elseif (isset($GLOBALS['HTTP_SESSION_VARS'][$name]))
            {
                $GLOBALS[$name] = $GLOBALS['HTTP_SESSION_VARS'][$name];
                return $GLOBALS['HTTP_SESSION_VARS'][$name];
            }
        }
    }

    function GetSIDString() {
        return session_name() . "=" . session_id();
    }

    function getSID() {
        return session_id();
    }

    function UnsetVar( $varname ) {
        if( !isset($varname) )
            die("To few parameters");

        if( phpversion() >= "4.1.0" )
        {
            if (isset($GLOBALS[$varname]))
                unset( $GLOBALS[$varname] );
            if (isset($GLOBALS['_SESSION'][$varname]))
                unset( $GLOBALS['_SESSION'][$varname] );
        }
        else
        {
            if (isset($GLOBALS[$varname]))
                unset( $GLOBALS[$varname] );
            if (isset($GLOBALS['HTTP_SESSION_VARS'][$varname]))
                unset( $GLOBALS['HTTP_SESSION_VARS'][$varname] );
        }
    }

    function sessionUnset() {
        if( phpversion() >= "4.1.0" )
        {
            if( isset($GLOBALS['_SESSION']) ) $a = $GLOBALS['_SESSION'];
            while( list($key,) = each($a) )
                $this->UnsetVar($key);
        }
        else
        {
            if( isset($GLOBALS['HTTP_SESSION_VARS']) ) $a = $GLOBALS['HTTP_SESSION_VARS'];
            while( list($key,) = each($a) )
                $this->UnsetVar($key);
        }
    }

    function Destroy() {
        $this->sessionUnset();
        session_destroy();
        
    }
}

?>