SID &amp; PHPSESSID

SID & PHPSESSID

What is the difference between SID & PHPSESSID. Which do u use to tie up Session id to URI & how?
Thanks
Sbs

PHPSESSID is the name of the sessionID variable.

SID automates the printing of the session ID, including the name of the variable

print SID;

You could also use

print "PHPSESSID=".session_id();