namespace.php

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     */
    protected function & __get($name)
    {
        if ($name === '') {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception("The '$name' key must be a non-empty string");
        }

        return parent::_namespaceGet($this->_namespace, $name);
    }


    /**
     * __set() - method to set a variable/value in this object's namespace
     *
     * @param string $name - programmatic name of a key, in a <key,value> pair in the current namespace
     * @param mixed $value - value in the <key,value> pair to assign to the $name key
     * @throws Zend_Session_Exception
     * @return true
     */
    protected function __set($name, $value)
    {
        if (isset(self::$_namespaceLocks[$this->_namespace])) {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception('This session/namespace has been marked as read-only.');
        }

        if ($name === '') {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception("The '$name' key must be a non-empty string");
        }

        if (parent::$_writable === false) {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception(parent::_THROW_NOT_WRITABLE_MSG);
        }

        $name = (string) $name;

        $_SESSION[$this->_namespace][$name] = $value;
    }


    /**
     * apply() - enables applying user-selected function, such as array_merge() to the namespace
     * Caveat: ignores members expiring now.
     *
     * Example:
     *   $namespace->apply('array_merge', array('tree' => 'apple', 'fruit' => 'peach'), array('flower' => 'rose'));
     *   $namespace->apply('count');
     *
     * @param string $callback - callback function
     * @param mixed  OPTIONAL arguments passed to the callback function
     */
    public function apply($callback)
    {
        $arg_list = func_get_args();
        $arg_list[0] = $_SESSION[$this->_namespace];
        return call_user_func_array($callback, $arg_list);
    }


    /**
     * applySet() - enables applying user-selected function, and sets entire namespace to the result
     * Result of $callback must be an array. Caveat: ignores members expiring now.
     *
     * Example:
     *   $namespace->applySet('array_merge', array('tree' => 'apple', 'fruit' => 'peach'), array('flower' => 'rose'));
     *
     * @param string $callback - callback function
     * @param mixed  OPTIONAL arguments passed to the callback function
     */
    public function applySet($callback)
    {
        $arg_list = func_get_args();
        $arg_list[0] = $_SESSION[$this->_namespace];
        $result = call_user_func_array($callback, $arg_list);
        if (!is_array($result)) {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception("Result must be an array. Got: " . gettype($result));
        }
        $_SESSION[$this->_namespace] = $result;
        return $result;
    }


    /**
     * __isset() - determine if a variable in this object's namespace is set
     *
     * @param string $name - programmatic name of a key, in a <key,value> pair in the current namespace
     * @return bool
     */
    protected function __isset($name)
    {
        if ($name === '') {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception("The '$name' key must be a non-empty string");
        }

        return parent::_namespaceIsset($this->_namespace, $name);
    }


    /**
     * __unset() - unset a variable in this object's namespace.
     *
     * @param string $name - programmatic name of a key, in a <key,value> pair in the current namespace
     * @return true
     */
    protected function __unset($name)
    {
        if ($name === '') {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception("The '$name' key must be a non-empty string");
        }

        return parent::_namespaceUnset($this->_namespace, $name);
    }


    /**
     * setExpirationSeconds() - expire the namespace, or specific variables after a specified
     * number of seconds
     *
     * @param int $seconds     - expires in this many seconds
     * @param mixed $variables - OPTIONAL list of variables to expire (defaults to all)
     * @throws Zend_Session_Exception
     * @return void
     */
    public function setExpirationSeconds($seconds, $variables = null)
    {
        if (parent::$_writable === false) {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception(parent::_THROW_NOT_WRITABLE_MSG);
        }

        if ($seconds <= 0) {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception('Seconds must be positive.');
        }

        if ($variables === null) {

            // apply expiration to entire namespace
            $_SESSION['__ZF'][$this->_namespace]['ENT'] = time() + $seconds;

        } else {

            if (is_string($variables)) {
                $variables = array($variables);
            }

            foreach ($variables as $variable) {
                if (!empty($variable)) {
                    $_SESSION['__ZF'][$this->_namespace]['ENVT'][$variable] = time() + $seconds;
                }
            }
        }
    }


    /**
     * setExpirationHops() - expire the namespace, or specific variables after a specified
     * number of page hops
     *
     * @param int $hops        - how many "hops" (number of subsequent requests) before expiring
     * @param mixed $variables - OPTIONAL list of variables to expire (defaults to all)
     * @param boolean $hopCountOnUsageOnly - OPTIONAL if set, only count a hop/request if this namespace is used
     * @throws Zend_Session_Exception
     * @return void
     */
    public function setExpirationHops($hops, $variables = null, $hopCountOnUsageOnly = false)
    {
        if (parent::$_writable === false) {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception(parent::_THROW_NOT_WRITABLE_MSG);
        }

        if ($hops <= 0) {
            /**
             * @see Zend_Session_Exception
             */
            require_once 'Zend/Session/Exception.php';
            throw new Zend_Session_Exception('Hops must be positive number.');
        }

        if ($variables === null) {

            // apply expiration to entire namespace
            if ($hopCountOnUsageOnly === false) {
                $_SESSION['__ZF'][$this->_namespace]['ENGH'] = $hops;
            } else {
                $_SESSION['__ZF'][$this->_namespace]['ENNH'] = $hops;
            }

        } else {

            if (is_string($variables)) {
                $variables = array($variables);
            }

            foreach ($variables as $variable) {
                if (!empty($variable)) {
                    if ($hopCountOnUsageOnly === false) {
                        $_SESSION['__ZF'][$this->_namespace]['ENVGH'][$variable] = $hops;
                    } else {
                        $_SESSION['__ZF'][$this->_namespace]['ENVNH'][$variable] = $hops;
                    }
                }
            }
        }
    }

}