481aef96_Cohn___Wolfe__Purpose
[Cookie] PHP session cookie [Business] session cookie [Cookie name] PHPSESSID [Purpose] 
The PHPSESSID cookie is native to PHP and enables websites to store serialised state data. On the Action website it is used to establish a user session and to pass state data via a temporary cookie, which is commonly referred to as a session cookie. As the PHPSESSID cookie has no timed expiry, it disappears when the client is closed.
Cohn & Wolfe
Purpose