need session_start() to recall session data.

["Matt Monaco" <mmonaco3@xxxxxxx>]

I have the following two methods as part of a class I'm using to transport 
data between pages.

    static function pack($object)
    {
        if (session_id() == "") {
            session_start();
        }

        $class = get_class($object);
        $_SESSION["cmsSessionArray"][$class] = serialize($object);
    }

    static function unpack($strObject)
    {
        session_start();
        return unserialize($_SESSION["cmsSessionArray"][$strObject]);
    }

the pack() method is called by the destructor of the objects I want to save 
like:
function __destruct()
{
    parent::pack($this);
}

On subsequent pages the session data is not available until I do a 
session_start().  Regardless of the fact that I think the session shouldn't 
need to be restarted, I don't like the fact that if indeed it has been 
closed that a session_start() on another page will bring back the data. 
(Note, fortunately this doesn't not occur if the browser window has been 
closed, at that point all session data is definitely lost as expected.)

Are session supposed to work this way? 

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