Is there any values to this function? I'm looking over some code where this is a done a bunch of time and I don't see any value to it. Maybe I'm naive about the internals but...
I'm not certain as to what exactly you are asking, but prior to PHP 4.1, I believe (possibly 4.2), session_register() is how one added elements to the session. This is before the $_SESSION variable existed. So the "value" of the function is storing session data, although that method is deprecated.
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