   #PHP Manual Session handling functions session_get_cookie_params
   session_is_registered

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                                  session_id

   (PHP 4 )
   session_id -- Get and/or set the current session id

Description

   string session_id ( [string id])

   session_id() returns the session id for the current session.

   If id is specified, it will replace the current session id.
   session_id() needs to be called before session_start() for that
   purpose. Depending on the session handler, not all characters are
   allowed within the session id. For example, the file session handler
   only allows characters in the range a-z, A-Z and 0-9!

   The constant SID can also be used to retrieve the current name and
   session id as a string suitable for adding to URLs. Note that SID is
   only defined if the client didn't send the right cookie. See also
   Session handling.

   See also session_start(), session_set_save_handler(), and
   session.save_handler.
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