One thing I couldn't get to the bottom of is PS(define_sid) and the 
define_sid logic in php_session_start().  I understand the code, but I 
couldn't understand why we define SID in certain cases to contain valid 
data, and sometimes just an empty string.  It's also being used in 
session_adapt_uris() later.

The other issue is a suggestion I want to pitch - right now, if sessions 
are started after the headers are already sent, we'll get a nice 
headers-already-sent error.  If we have trans_sid enabled (which we will 
most probably, from now on) - we can check whether the headers are already 
sent, and if they are, move to use trans_sid instead.  Any comments?


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