Sessions lost when server restart or class reload

[Carlos Romero Mas]

When a class is reloaded because you have change it the objects saved on
sessions are lost and all the users connected to that application suffer
that.

Then, one of the more interesting aspects of web applications are lost:
change the application on fly transparently for most users of that
application. Have ever find a solution? I am thinking rebuild on PHP...

Thanks in advance for your attention.