Maybe you check out the internals archives as an discussion about this topic
was held 1-2 days ago.
> Hi all
>
> Using PHP5, I am trying to save some properties of an object when it
> is destroyed in its destructor, __destruct(). However, I have found
> that the session variable is NOT stored unless I explicitly destroy
> the object using unset(). If I leave php to finish executing the
> script and automatically destroy the object, the destructor IS called,
> however, the session variables are NOT saved. A quick code example
> for clarity:
>
> -----
> class StateMachine {
> public $stateVariable;
> function __destruct() {
> $_SESSION['state'] = $this->stateVariable;
> }
> }
>
> $sm = new StateMachine();
> if (isset($_SESSION['state'])) {
> $sm->stateVariable = $_SESSION['state'];
> } else {
> $sm->stateVariable = 'foobar';
> }
> ----
>
> (please ignore the obvious bad coding standard of making that var
> public and accessing it, this is for simplicity of the example).
>
> Unless I do an unset($sm); at the end of a script like this, the
> $_SESSION array will never contain the state=>foobar key/value.
>
> Can anyone offer some insight into this?
>
> Thanks!
> Dave
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