And I think if you try to enter characters into a session ID that aren't valid, PHP will give you a blank session ID, or generate a new one. I just remember from a while ago that when I attempted to create my own session ID in my PHP script, I couldn't enter any values outside of the hexadecimal range because I hadn't change the session ID character type.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.