Description:
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If you enable session.using use_trans_sid, and have two different sessions (different name), like if you have a site session and a phpbb session, the url gets invalid.

PHP does not recognize that there are two sessions to append to the url and prefix both of them with ?. This makes the url like this: index.php?sess_name=xxx?=sess_name2=xxx. This is ofcourse invalid and php doesnt recognize either of those sessions.

Reproduce code:
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above

Expected result:
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Recognize multiple sessions and put the correct argument delimiter inbetweeen (& or so)

Actual result:
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...